mtip32xx.c 103.3 KB
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/*
 * Driver for the Micron P320 SSD
 *   Copyright (C) 2011 Micron Technology, Inc.
 *
 * Portions of this code were derived from works subjected to the
 * following copyright:
 *    Copyright (C) 2009 Integrated Device Technology, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/uaccess.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/compat.h>
#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/genhd.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/dma-mapping.h>
#include <linux/idr.h>
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#include <linux/kthread.h>
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#include <../drivers/ata/ahci.h>
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#include <linux/export.h>
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#include <linux/debugfs.h>
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#include "mtip32xx.h"

#define HW_CMD_SLOT_SZ		(MTIP_MAX_COMMAND_SLOTS * 32)
#define HW_CMD_TBL_SZ		(AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
#define HW_CMD_TBL_AR_SZ	(HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
#define HW_PORT_PRIV_DMA_SZ \
		(HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)

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#define HOST_CAP_NZDMA		(1 << 19)
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#define HOST_HSORG		0xFC
#define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
#define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
#define HSORG_HWREV		0xFF00
#define HSORG_STYLE		0x8
#define HSORG_SLOTGROUPS	0x7

#define PORT_COMMAND_ISSUE	0x38
#define PORT_SDBV		0x7C

#define PORT_OFFSET		0x100
#define PORT_MEM_SIZE		0x80

#define PORT_IRQ_ERR \
	(PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
	 PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
	 PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
	 PORT_IRQ_OVERFLOW)
#define PORT_IRQ_LEGACY \
	(PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
#define PORT_IRQ_HANDLED \
	(PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
	 PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
	 PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
#define DEF_PORT_IRQ \
	(PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)

/* product numbers */
#define MTIP_PRODUCT_UNKNOWN	0x00
#define MTIP_PRODUCT_ASICFPGA	0x11

/* Device instance number, incremented each time a device is probed. */
static int instance;

/*
 * Global variable used to hold the major block device number
 * allocated in mtip_init().
 */
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static int mtip_major;
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static struct dentry *dfs_parent;
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static DEFINE_SPINLOCK(rssd_index_lock);
static DEFINE_IDA(rssd_index_ida);

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static int mtip_block_initialize(struct driver_data *dd);

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#ifdef CONFIG_COMPAT
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struct mtip_compat_ide_task_request_s {
	__u8		io_ports[8];
	__u8		hob_ports[8];
	ide_reg_valid_t	out_flags;
	ide_reg_valid_t	in_flags;
	int		data_phase;
	int		req_cmd;
	compat_ulong_t	out_size;
	compat_ulong_t	in_size;
};
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#endif
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/*
 * This function check_for_surprise_removal is called
 * while card is removed from the system and it will
 * read the vendor id from the configration space
 *
 * @pdev Pointer to the pci_dev structure.
 *
 * return value
 *	 true if device removed, else false
 */
static bool mtip_check_surprise_removal(struct pci_dev *pdev)
{
	u16 vendor_id = 0;

       /* Read the vendorID from the configuration space */
	pci_read_config_word(pdev, 0x00, &vendor_id);
	if (vendor_id == 0xFFFF)
		return true; /* device removed */

	return false; /* device present */
}

/*
 * This function is called for clean the pending command in the
 * command slot during the surprise removal of device and return
 * error to the upper layer.
 *
 * @dd Pointer to the DRIVER_DATA structure.
 *
 * return value
 *	None
 */
static void mtip_command_cleanup(struct driver_data *dd)
{
	int group = 0, commandslot = 0, commandindex = 0;
	struct mtip_cmd *command;
	struct mtip_port *port = dd->port;
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	static int in_progress;

	if (in_progress)
		return;

	in_progress = 1;
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	for (group = 0; group < 4; group++) {
		for (commandslot = 0; commandslot < 32; commandslot++) {
			if (!(port->allocated[group] & (1 << commandslot)))
				continue;

			commandindex = group << 5 | commandslot;
			command = &port->commands[commandindex];

			if (atomic_read(&command->active)
			    && (command->async_callback)) {
				command->async_callback(command->async_data,
					-ENODEV);
				command->async_callback = NULL;
				command->async_data = NULL;
			}

			dma_unmap_sg(&port->dd->pdev->dev,
				command->sg,
				command->scatter_ents,
				command->direction);
		}
	}

	up(&port->cmd_slot);

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	set_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag);
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	in_progress = 0;
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}

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/*
 * Obtain an empty command slot.
 *
 * This function needs to be reentrant since it could be called
 * at the same time on multiple CPUs. The allocation of the
 * command slot must be atomic.
 *
 * @port Pointer to the port data structure.
 *
 * return value
 *	>= 0	Index of command slot obtained.
 *	-1	No command slots available.
 */
static int get_slot(struct mtip_port *port)
{
	int slot, i;
	unsigned int num_command_slots = port->dd->slot_groups * 32;

	/*
	 * Try 10 times, because there is a small race here.
	 *  that's ok, because it's still cheaper than a lock.
	 *
	 * Race: Since this section is not protected by lock, same bit
	 * could be chosen by different process contexts running in
	 * different processor. So instead of costly lock, we are going
	 * with loop.
	 */
	for (i = 0; i < 10; i++) {
		slot = find_next_zero_bit(port->allocated,
					 num_command_slots, 1);
		if ((slot < num_command_slots) &&
		    (!test_and_set_bit(slot, port->allocated)))
			return slot;
	}
	dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n");

	if (mtip_check_surprise_removal(port->dd->pdev)) {
		/* Device not present, clean outstanding commands */
		mtip_command_cleanup(port->dd);
	}
	return -1;
}

/*
 * Release a command slot.
 *
 * @port Pointer to the port data structure.
 * @tag  Tag of command to release
 *
 * return value
 *	None
 */
static inline void release_slot(struct mtip_port *port, int tag)
{
	smp_mb__before_clear_bit();
	clear_bit(tag, port->allocated);
	smp_mb__after_clear_bit();
}

/*
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 * Reset the HBA (without sleeping)
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 *
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 * Just like hba_reset, except does not call sleep, so can be
 * run from interrupt/tasklet context.
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 *
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 * @dd Pointer to the driver data structure.
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 *
 * return value
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 *	0	The reset was successful.
 *	-1	The HBA Reset bit did not clear.
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 */
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static int hba_reset_nosleep(struct driver_data *dd)
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{
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	unsigned long timeout;
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	/* Chip quirk: quiesce any chip function */
	mdelay(10);
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	/* Set the reset bit */
	writel(HOST_RESET, dd->mmio + HOST_CTL);
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	/* Flush */
	readl(dd->mmio + HOST_CTL);
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	/*
	 * Wait 10ms then spin for up to 1 second
	 * waiting for reset acknowledgement
	 */
	timeout = jiffies + msecs_to_jiffies(1000);
	mdelay(10);
	while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
		 && time_before(jiffies, timeout))
		mdelay(1);
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	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
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		return -1;

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	if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
		return -1;
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	return 0;
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}

/*
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 * Issue a command to the hardware.
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 *
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 * Set the appropriate bit in the s_active and Command Issue hardware
 * registers, causing hardware command processing to begin.
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 *
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 * @port Pointer to the port structure.
 * @tag  The tag of the command to be issued.
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 *
 * return value
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 *      None
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 */
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static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
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{
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	atomic_set(&port->commands[tag].active, 1);
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	spin_lock(&port->cmd_issue_lock);
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	writel((1 << MTIP_TAG_BIT(tag)),
			port->s_active[MTIP_TAG_INDEX(tag)]);
	writel((1 << MTIP_TAG_BIT(tag)),
			port->cmd_issue[MTIP_TAG_INDEX(tag)]);
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	spin_unlock(&port->cmd_issue_lock);
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	/* Set the command's timeout value.*/
	port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
					MTIP_NCQ_COMMAND_TIMEOUT_MS);
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}

/*
 * Enable/disable the reception of FIS
 *
 * @port   Pointer to the port data structure
 * @enable 1 to enable, 0 to disable
 *
 * return value
 *	Previous state: 1 enabled, 0 disabled
 */
static int mtip_enable_fis(struct mtip_port *port, int enable)
{
	u32 tmp;

	/* enable FIS reception */
	tmp = readl(port->mmio + PORT_CMD);
	if (enable)
		writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
	else
		writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);

	/* Flush */
	readl(port->mmio + PORT_CMD);

	return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
}

/*
 * Enable/disable the DMA engine
 *
 * @port   Pointer to the port data structure
 * @enable 1 to enable, 0 to disable
 *
 * return value
 *	Previous state: 1 enabled, 0 disabled.
 */
static int mtip_enable_engine(struct mtip_port *port, int enable)
{
	u32 tmp;

	/* enable FIS reception */
	tmp = readl(port->mmio + PORT_CMD);
	if (enable)
		writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
	else
		writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);

	readl(port->mmio + PORT_CMD);
	return (((tmp & PORT_CMD_START) == PORT_CMD_START));
}

/*
 * Enables the port DMA engine and FIS reception.
 *
 * return value
 *	None
 */
static inline void mtip_start_port(struct mtip_port *port)
{
	/* Enable FIS reception */
	mtip_enable_fis(port, 1);

	/* Enable the DMA engine */
	mtip_enable_engine(port, 1);
}

/*
 * Deinitialize a port by disabling port interrupts, the DMA engine,
 * and FIS reception.
 *
 * @port Pointer to the port structure
 *
 * return value
 *	None
 */
static inline void mtip_deinit_port(struct mtip_port *port)
{
	/* Disable interrupts on this port */
	writel(0, port->mmio + PORT_IRQ_MASK);

	/* Disable the DMA engine */
	mtip_enable_engine(port, 0);

	/* Disable FIS reception */
	mtip_enable_fis(port, 0);
}

/*
 * Initialize a port.
 *
 * This function deinitializes the port by calling mtip_deinit_port() and
 * then initializes it by setting the command header and RX FIS addresses,
 * clearing the SError register and any pending port interrupts before
 * re-enabling the default set of port interrupts.
 *
 * @port Pointer to the port structure.
 *
 * return value
 *	None
 */
static void mtip_init_port(struct mtip_port *port)
{
	int i;
	mtip_deinit_port(port);

	/* Program the command list base and FIS base addresses */
	if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
		writel((port->command_list_dma >> 16) >> 16,
			 port->mmio + PORT_LST_ADDR_HI);
		writel((port->rxfis_dma >> 16) >> 16,
			 port->mmio + PORT_FIS_ADDR_HI);
	}

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	writel(port->command_list_dma & 0xFFFFFFFF,
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			port->mmio + PORT_LST_ADDR);
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	writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
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	/* Clear SError */
	writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);

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	/* reset the completed registers.*/
	for (i = 0; i < port->dd->slot_groups; i++)
		writel(0xFFFFFFFF, port->completed[i]);
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	/* Clear any pending interrupts for this port */
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	writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
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	/* Clear any pending interrupts on the HBA. */
	writel(readl(port->dd->mmio + HOST_IRQ_STAT),
					port->dd->mmio + HOST_IRQ_STAT);

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	/* Enable port interrupts */
	writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
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}

/*
 * Restart a port
 *
 * @port Pointer to the port data structure.
 *
 * return value
 *	None
 */
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static void mtip_restart_port(struct mtip_port *port)
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{
	unsigned long timeout;

	/* Disable the DMA engine */
	mtip_enable_engine(port, 0);

	/* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
	timeout = jiffies + msecs_to_jiffies(500);
	while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
		 && time_before(jiffies, timeout))
		;

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	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
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		return;

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	/*
	 * Chip quirk: escalate to hba reset if
	 * PxCMD.CR not clear after 500 ms
	 */
	if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
		dev_warn(&port->dd->pdev->dev,
			"PxCMD.CR not clear, escalating reset\n");

		if (hba_reset_nosleep(port->dd))
			dev_err(&port->dd->pdev->dev,
				"HBA reset escalation failed.\n");

		/* 30 ms delay before com reset to quiesce chip */
		mdelay(30);
	}

	dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");

	/* Set PxSCTL.DET */
	writel(readl(port->mmio + PORT_SCR_CTL) |
			 1, port->mmio + PORT_SCR_CTL);
	readl(port->mmio + PORT_SCR_CTL);

	/* Wait 1 ms to quiesce chip function */
	timeout = jiffies + msecs_to_jiffies(1);
	while (time_before(jiffies, timeout))
		;

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	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
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		return;

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	/* Clear PxSCTL.DET */
	writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
			 port->mmio + PORT_SCR_CTL);
	readl(port->mmio + PORT_SCR_CTL);

	/* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
	timeout = jiffies + msecs_to_jiffies(500);
	while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
			 && time_before(jiffies, timeout))
		;

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	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
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		return;

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	if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
		dev_warn(&port->dd->pdev->dev,
			"COM reset failed\n");

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	mtip_init_port(port);
	mtip_start_port(port);
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}

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/*
 * Helper function for tag logging
 */
static void print_tags(struct driver_data *dd,
			char *msg,
			unsigned long *tagbits,
			int cnt)
{
	unsigned char tagmap[128];
	int group, tagmap_len = 0;

	memset(tagmap, 0, sizeof(tagmap));
	for (group = SLOTBITS_IN_LONGS; group > 0; group--)
		tagmap_len = sprintf(tagmap + tagmap_len, "%016lX ",
						tagbits[group-1]);
	dev_warn(&dd->pdev->dev,
			"%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
}

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/*
 * Called periodically to see if any read/write commands are
 * taking too long to complete.
 *
 * @data Pointer to the PORT data structure.
 *
 * return value
 *	None
 */
static void mtip_timeout_function(unsigned long int data)
{
	struct mtip_port *port = (struct mtip_port *) data;
	struct host_to_dev_fis *fis;
	struct mtip_cmd *command;
	int tag, cmdto_cnt = 0;
	unsigned int bit, group;
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	unsigned int num_command_slots;
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	unsigned long to, tagaccum[SLOTBITS_IN_LONGS];
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	if (unlikely(!port))
		return;

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	if (test_bit(MTIP_DDF_RESUME_BIT, &port->dd->dd_flag)) {
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		mod_timer(&port->cmd_timer,
			jiffies + msecs_to_jiffies(30000));
		return;
	}
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	/* clear the tag accumulator */
	memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
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	num_command_slots = port->dd->slot_groups * 32;
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	for (tag = 0; tag < num_command_slots; tag++) {
		/*
		 * Skip internal command slot as it has
		 * its own timeout mechanism
		 */
		if (tag == MTIP_TAG_INTERNAL)
			continue;

		if (atomic_read(&port->commands[tag].active) &&
		   (time_after(jiffies, port->commands[tag].comp_time))) {
			group = tag >> 5;
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			bit = tag & 0x1F;
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			command = &port->commands[tag];
			fis = (struct host_to_dev_fis *) command->command;

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			set_bit(tag, tagaccum);
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			cmdto_cnt++;
			if (cmdto_cnt == 1)
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				set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
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			/*
			 * Clear the completed bit. This should prevent
			 *  any interrupt handlers from trying to retire
			 *  the command.
			 */
			writel(1 << bit, port->completed[group]);

			/* Call the async completion callback. */
			if (likely(command->async_callback))
				command->async_callback(command->async_data,
							 -EIO);
			command->async_callback = NULL;
			command->comp_func = NULL;

			/* Unmap the DMA scatter list entries */
			dma_unmap_sg(&port->dd->pdev->dev,
					command->sg,
					command->scatter_ents,
					command->direction);

			/*
			 * Clear the allocated bit and active tag for the
			 * command.
			 */
			atomic_set(&port->commands[tag].active, 0);
			release_slot(port, tag);

			up(&port->cmd_slot);
		}
	}

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	if (cmdto_cnt) {
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		print_tags(port->dd, "timed out", tagaccum, cmdto_cnt);
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		if (!test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
			mtip_restart_port(port);
			wake_up_interruptible(&port->svc_wait);
		}
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		clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
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	}

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	if (port->ic_pause_timer) {
		to  = port->ic_pause_timer + msecs_to_jiffies(1000);
		if (time_after(jiffies, to)) {
			if (!test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
				port->ic_pause_timer = 0;
				clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
				clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
				clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
				wake_up_interruptible(&port->svc_wait);
			}


		}
	}

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	/* Restart the timer */
	mod_timer(&port->cmd_timer,
		jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
}

/*
 * IO completion function.
 *
 * This completion function is called by the driver ISR when a
 * command that was issued by the kernel completes. It first calls the
 * asynchronous completion function which normally calls back into the block
 * layer passing the asynchronous callback data, then unmaps the
 * scatter list associated with the completed command, and finally
 * clears the allocated bit associated with the completed command.
 *
 * @port   Pointer to the port data structure.
 * @tag    Tag of the command.
 * @data   Pointer to driver_data.
 * @status Completion status.
 *
 * return value
 *	None
 */
static void mtip_async_complete(struct mtip_port *port,
				int tag,
				void *data,
				int status)
{
	struct mtip_cmd *command;
	struct driver_data *dd = data;
	int cb_status = status ? -EIO : 0;

	if (unlikely(!dd) || unlikely(!port))
		return;

	command = &port->commands[tag];

	if (unlikely(status == PORT_IRQ_TF_ERR)) {
		dev_warn(&port->dd->pdev->dev,
			"Command tag %d failed due to TFE\n", tag);
	}

	/* Upper layer callback */
	if (likely(command->async_callback))
		command->async_callback(command->async_data, cb_status);

	command->async_callback = NULL;
	command->comp_func = NULL;

	/* Unmap the DMA scatter list entries */
	dma_unmap_sg(&dd->pdev->dev,
		command->sg,
		command->scatter_ents,
		command->direction);

	/* Clear the allocated and active bits for the command */
	atomic_set(&port->commands[tag].active, 0);
	release_slot(port, tag);

	up(&port->cmd_slot);
}

/*
 * Internal command completion callback function.
 *
 * This function is normally called by the driver ISR when an internal
 * command completed. This function signals the command completion by
 * calling complete().
 *
 * @port   Pointer to the port data structure.
 * @tag    Tag of the command that has completed.
 * @data   Pointer to a completion structure.
 * @status Completion status.
 *
 * return value
 *	None
 */
static void mtip_completion(struct mtip_port *port,
			    int tag,
			    void *data,
			    int status)
{
	struct mtip_cmd *command = &port->commands[tag];
	struct completion *waiting = data;
	if (unlikely(status == PORT_IRQ_TF_ERR))
		dev_warn(&port->dd->pdev->dev,
			"Internal command %d completed with TFE\n", tag);

	command->async_callback = NULL;
	command->comp_func = NULL;

	complete(waiting);
}

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747 748 749 750 751 752 753 754
static void mtip_null_completion(struct mtip_port *port,
			    int tag,
			    void *data,
			    int status)
{
	return;
}

755 756 757 758
static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
				dma_addr_t buffer_dma, unsigned int sectors);
static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
						struct smart_attr *attrib);
759 760 761 762 763 764 765 766 767 768
/*
 * Handle an error.
 *
 * @dd Pointer to the DRIVER_DATA structure.
 *
 * return value
 *	None
 */
static void mtip_handle_tfe(struct driver_data *dd)
{
769
	int group, tag, bit, reissue, rv;
770
	struct mtip_port *port;
771
	struct mtip_cmd  *cmd;
772 773 774
	u32 completed;
	struct host_to_dev_fis *fis;
	unsigned long tagaccum[SLOTBITS_IN_LONGS];
775
	unsigned int cmd_cnt = 0;
776 777 778
	unsigned char *buf;
	char *fail_reason = NULL;
	int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
779 780 781 782 783 784 785

	dev_warn(&dd->pdev->dev, "Taskfile error\n");

	port = dd->port;

	/* Stop the timer to prevent command timeouts. */
	del_timer(&port->cmd_timer);
786 787 788 789 790 791 792 793 794 795 796 797 798 799
	set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);

	if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
			test_bit(MTIP_TAG_INTERNAL, port->allocated)) {
		cmd = &port->commands[MTIP_TAG_INTERNAL];
		dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");

		atomic_inc(&cmd->active); /* active > 1 indicates error */
		if (cmd->comp_data && cmd->comp_func) {
			cmd->comp_func(port, MTIP_TAG_INTERNAL,
					cmd->comp_data, PORT_IRQ_TF_ERR);
		}
		goto handle_tfe_exit;
	}
800

801 802 803
	/* clear the tag accumulator */
	memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));

804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	/* Loop through all the groups */
	for (group = 0; group < dd->slot_groups; group++) {
		completed = readl(port->completed[group]);

		/* clear completed status register in the hardware.*/
		writel(completed, port->completed[group]);

		/* Process successfully completed commands */
		for (bit = 0; bit < 32 && completed; bit++) {
			if (!(completed & (1<<bit)))
				continue;
			tag = (group << 5) + bit;

			/* Skip the internal command slot */
			if (tag == MTIP_TAG_INTERNAL)
				continue;

821 822
			cmd = &port->commands[tag];
			if (likely(cmd->comp_func)) {
823
				set_bit(tag, tagaccum);
824
				cmd_cnt++;
825 826
				atomic_set(&cmd->active, 0);
				cmd->comp_func(port,
827
					 tag,
828
					 cmd->comp_data,
829 830 831 832 833 834 835 836 837 838 839 840 841
					 0);
			} else {
				dev_err(&port->dd->pdev->dev,
					"Missing completion func for tag %d",
					tag);
				if (mtip_check_surprise_removal(dd->pdev)) {
					mtip_command_cleanup(dd);
					/* don't proceed further */
					return;
				}
			}
		}
	}
842 843

	print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
844 845 846 847 848

	/* Restart the port */
	mdelay(20);
	mtip_restart_port(port);

849 850 851 852 853 854 855 856 857 858 859 860 861
	/* Trying to determine the cause of the error */
	rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
				dd->port->log_buf,
				dd->port->log_buf_dma, 1);
	if (rv) {
		dev_warn(&dd->pdev->dev,
			"Error in READ LOG EXT (10h) command\n");
		/* non-critical error, don't fail the load */
	} else {
		buf = (unsigned char *)dd->port->log_buf;
		if (buf[259] & 0x1) {
			dev_info(&dd->pdev->dev,
				"Write protect bit is set.\n");
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862
			set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
863 864 865 866 867 868
			fail_all_ncq_write = 1;
			fail_reason = "write protect";
		}
		if (buf[288] == 0xF7) {
			dev_info(&dd->pdev->dev,
				"Exceeded Tmax, drive in thermal shutdown.\n");
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869
			set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
870 871 872 873 874 875 876 877 878 879 880
			fail_all_ncq_cmds = 1;
			fail_reason = "thermal shutdown";
		}
		if (buf[288] == 0xBF) {
			dev_info(&dd->pdev->dev,
				"Drive indicates rebuild has failed.\n");
			fail_all_ncq_cmds = 1;
			fail_reason = "rebuild failed";
		}
	}

881 882 883 884 885 886 887 888
	/* clear the tag accumulator */
	memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));

	/* Loop through all the groups */
	for (group = 0; group < dd->slot_groups; group++) {
		for (bit = 0; bit < 32; bit++) {
			reissue = 1;
			tag = (group << 5) + bit;
889
			cmd = &port->commands[tag];
890 891

			/* If the active bit is set re-issue the command */
892
			if (atomic_read(&cmd->active) == 0)
893 894
				continue;

895
			fis = (struct host_to_dev_fis *)cmd->command;
896 897 898 899 900

			/* Should re-issue? */
			if (tag == MTIP_TAG_INTERNAL ||
			    fis->command == ATA_CMD_SET_FEATURES)
				reissue = 0;
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
			else {
				if (fail_all_ncq_cmds ||
					(fail_all_ncq_write &&
					fis->command == ATA_CMD_FPDMA_WRITE)) {
					dev_warn(&dd->pdev->dev,
					"  Fail: %s w/tag %d [%s].\n",
					fis->command == ATA_CMD_FPDMA_WRITE ?
						"write" : "read",
					tag,
					fail_reason != NULL ?
						fail_reason : "unknown");
					atomic_set(&cmd->active, 0);
					if (cmd->comp_func) {
						cmd->comp_func(port, tag,
							cmd->comp_data,
							-ENODATA);
					}
					continue;
				}
			}
921 922 923 924 925

			/*
			 * First check if this command has
			 *  exceeded its retries.
			 */
926
			if (reissue && (cmd->retries-- > 0)) {
927 928 929 930 931 932 933 934 935 936 937 938

				set_bit(tag, tagaccum);

				/* Re-issue the command. */
				mtip_issue_ncq_command(port, tag);

				continue;
			}

			/* Retire a command that will not be reissued */
			dev_warn(&port->dd->pdev->dev,
				"retiring tag %d\n", tag);
939
			atomic_set(&cmd->active, 0);
940

941 942
			if (cmd->comp_func)
				cmd->comp_func(
943 944
					port,
					tag,
945
					cmd->comp_data,
946 947 948 949 950 951 952
					PORT_IRQ_TF_ERR);
			else
				dev_warn(&port->dd->pdev->dev,
					"Bad completion for tag %d\n",
					tag);
		}
	}
953
	print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
954

955
handle_tfe_exit:
956
	/* clear eh_active */
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	clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
958
	wake_up_interruptible(&port->svc_wait);
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976

	mod_timer(&port->cmd_timer,
		 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
}

/*
 * Handle a set device bits interrupt
 */
static inline void mtip_process_sdbf(struct driver_data *dd)
{
	struct mtip_port  *port = dd->port;
	int group, tag, bit;
	u32 completed;
	struct mtip_cmd *command;

	/* walk all bits in all slot groups */
	for (group = 0; group < dd->slot_groups; group++) {
		completed = readl(port->completed[group]);
977 978
		if (!completed)
			continue;
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026

		/* clear completed status register in the hardware.*/
		writel(completed, port->completed[group]);

		/* Process completed commands. */
		for (bit = 0;
		     (bit < 32) && completed;
		     bit++, completed >>= 1) {
			if (completed & 0x01) {
				tag = (group << 5) | bit;

				/* skip internal command slot. */
				if (unlikely(tag == MTIP_TAG_INTERNAL))
					continue;

				command = &port->commands[tag];
				/* make internal callback */
				if (likely(command->comp_func)) {
					command->comp_func(
						port,
						tag,
						command->comp_data,
						0);
				} else {
					dev_warn(&dd->pdev->dev,
						"Null completion "
						"for tag %d",
						tag);

					if (mtip_check_surprise_removal(
						dd->pdev)) {
						mtip_command_cleanup(dd);
						return;
					}
				}
			}
		}
	}
}

/*
 * Process legacy pio and d2h interrupts
 */
static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
{
	struct mtip_port *port = dd->port;
	struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];

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1027
	if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
1028
	    (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
		& (1 << MTIP_TAG_INTERNAL))) {
		if (cmd->comp_func) {
			cmd->comp_func(port,
				MTIP_TAG_INTERNAL,
				cmd->comp_data,
				0);
			return;
		}
	}

	return;
}

/*
 * Demux and handle errors
 */
static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
{
	if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
		mtip_handle_tfe(dd);

	if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
		dev_warn(&dd->pdev->dev,
			"Clearing PxSERR.DIAG.x\n");
		writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
	}

	if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
		dev_warn(&dd->pdev->dev,
			"Clearing PxSERR.DIAG.n\n");
		writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
	}

	if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
		dev_warn(&dd->pdev->dev,
			"Port stat errors %x unhandled\n",
			(port_stat & ~PORT_IRQ_HANDLED));
	}
}

static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
{
	struct driver_data *dd = (struct driver_data *) data;
	struct mtip_port *port = dd->port;
	u32 hba_stat, port_stat;
	int rv = IRQ_NONE;

	hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
	if (hba_stat) {
		rv = IRQ_HANDLED;

		/* Acknowledge the interrupt status on the port.*/
		port_stat = readl(port->mmio + PORT_IRQ_STAT);
		writel(port_stat, port->mmio + PORT_IRQ_STAT);

		/* Demux port status */
		if (likely(port_stat & PORT_IRQ_SDB_FIS))
			mtip_process_sdbf(dd);

		if (unlikely(port_stat & PORT_IRQ_ERR)) {
			if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
				mtip_command_cleanup(dd);
				/* don't proceed further */
				return IRQ_HANDLED;
			}
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1094
			if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1095 1096
							&dd->dd_flag))
				return rv;
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143

			mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
		}

		if (unlikely(port_stat & PORT_IRQ_LEGACY))
			mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
	}

	/* acknowledge interrupt */
	writel(hba_stat, dd->mmio + HOST_IRQ_STAT);

	return rv;
}

/*
 * Wrapper for mtip_handle_irq
 * (ignores return code)
 */
static void mtip_tasklet(unsigned long data)
{
	mtip_handle_irq((struct driver_data *) data);
}

/*
 * HBA interrupt subroutine.
 *
 * @irq		IRQ number.
 * @instance	Pointer to the driver data structure.
 *
 * return value
 *	IRQ_HANDLED	A HBA interrupt was pending and handled.
 *	IRQ_NONE	This interrupt was not for the HBA.
 */
static irqreturn_t mtip_irq_handler(int irq, void *instance)
{
	struct driver_data *dd = instance;
	tasklet_schedule(&dd->tasklet);
	return IRQ_HANDLED;
}

static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
{
	atomic_set(&port->commands[tag].active, 1);
	writel(1 << MTIP_TAG_BIT(tag),
		port->cmd_issue[MTIP_TAG_INDEX(tag)]);
}

1144 1145 1146 1147 1148 1149 1150 1151 1152
static bool mtip_pause_ncq(struct mtip_port *port,
				struct host_to_dev_fis *fis)
{
	struct host_to_dev_fis *reply;
	unsigned long task_file_data;

	reply = port->rxfis + RX_FIS_D2H_REG;
	task_file_data = readl(port->mmio+PORT_TFDATA);

1153 1154 1155 1156
	if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
		clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);

	if ((task_file_data & 1))
1157 1158 1159 1160
		return false;

	if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
		set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1161
		set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
		port->ic_pause_timer = jiffies;
		return true;
	} else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
					(fis->features == 0x03)) {
		set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
		port->ic_pause_timer = jiffies;
		return true;
	} else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
		((fis->command == 0xFC) &&
			(fis->features == 0x27 || fis->features == 0x72 ||
			 fis->features == 0x62 || fis->features == 0x26))) {
		/* Com reset after secure erase or lowlevel format */
		mtip_restart_port(port);
		return false;
	}

	return false;
}

1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
/*
 * Wait for port to quiesce
 *
 * @port    Pointer to port data structure
 * @timeout Max duration to wait (ms)
 *
 * return value
 *	0	Success
 *	-EBUSY  Commands still active
 */
static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
{
	unsigned long to;
1194 1195
	unsigned int n;
	unsigned int active = 1;
1196 1197 1198

	to = jiffies + msecs_to_jiffies(timeout);
	do {
A
Asai Thambi S P 已提交
1199 1200
		if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
			test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1201 1202 1203
			msleep(20);
			continue; /* svc thd is actively issuing commands */
		}
A
Asai Thambi S P 已提交
1204
		if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1205
			return -EFAULT;
1206 1207 1208 1209
		/*
		 * Ignore s_active bit 0 of array element 0.
		 * This bit will always be set
		 */
1210
		active = readl(port->s_active[0]) & 0xFFFFFFFE;
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
		for (n = 1; n < port->dd->slot_groups; n++)
			active |= readl(port->s_active[n]);

		if (!active)
			break;

		msleep(20);
	} while (time_before(jiffies, to));

	return active ? -EBUSY : 0;
}

/*
 * Execute an internal command and wait for the completion.
 *
 * @port    Pointer to the port data structure.
 * @fis     Pointer to the FIS that describes the command.
1228
 * @fis_len  Length in WORDS of the FIS.
1229
 * @buffer  DMA accessible for command data.
1230
 * @buf_len  Length, in bytes, of the data buffer.
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
 * @opts    Command header options, excluding the FIS length
 *             and the number of PRD entries.
 * @timeout Time in ms to wait for the command to complete.
 *
 * return value
 *	0	 Command completed successfully.
 *	-EFAULT  The buffer address is not correctly aligned.
 *	-EBUSY   Internal command or other IO in progress.
 *	-EAGAIN  Time out waiting for command to complete.
 */
static int mtip_exec_internal_command(struct mtip_port *port,
A
Asai Thambi S P 已提交
1242
					struct host_to_dev_fis *fis,
1243
					int fis_len,
1244
					dma_addr_t buffer,
1245
					int buf_len,
1246 1247 1248 1249 1250 1251
					u32 opts,
					gfp_t atomic,
					unsigned long timeout)
{
	struct mtip_cmd_sg *command_sg;
	DECLARE_COMPLETION_ONSTACK(wait);
1252
	int rv = 0, ready2go = 1;
1253
	struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1254
	unsigned long to;
1255 1256 1257 1258 1259 1260 1261 1262

	/* Make sure the buffer is 8 byte aligned. This is asic specific. */
	if (buffer & 0x00000007) {
		dev_err(&port->dd->pdev->dev,
			"SG buffer is not 8 byte aligned\n");
		return -EFAULT;
	}

1263 1264 1265 1266 1267 1268 1269 1270 1271
	to = jiffies + msecs_to_jiffies(timeout);
	do {
		ready2go = !test_and_set_bit(MTIP_TAG_INTERNAL,
						port->allocated);
		if (ready2go)
			break;
		mdelay(100);
	} while (time_before(jiffies, to));
	if (!ready2go) {
1272
		dev_warn(&port->dd->pdev->dev,
1273
			"Internal cmd active. new cmd [%02X]\n", fis->command);
1274 1275
		return -EBUSY;
	}
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	set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1277 1278 1279 1280 1281 1282
	port->ic_pause_timer = 0;

	if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
		clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
	else if (fis->command == ATA_CMD_DOWNLOAD_MICRO)
		clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1283 1284

	if (atomic == GFP_KERNEL) {
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1285 1286 1287 1288 1289 1290
		if (fis->command != ATA_CMD_STANDBYNOW1) {
			/* wait for io to complete if non atomic */
			if (mtip_quiesce_io(port, 5000) < 0) {
				dev_warn(&port->dd->pdev->dev,
					"Failed to quiesce IO\n");
				release_slot(port, MTIP_TAG_INTERNAL);
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1291
				clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
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1292 1293 1294
				wake_up_interruptible(&port->svc_wait);
				return -EBUSY;
			}
1295 1296 1297 1298 1299 1300 1301 1302 1303
		}

		/* Set the completion function and data for the command. */
		int_cmd->comp_data = &wait;
		int_cmd->comp_func = mtip_completion;

	} else {
		/* Clear completion - we're going to poll */
		int_cmd->comp_data = NULL;
A
Asai Thambi S P 已提交
1304
		int_cmd->comp_func = mtip_null_completion;
1305 1306 1307
	}

	/* Copy the command to the command table */
1308
	memcpy(int_cmd->command, fis, fis_len*4);
1309 1310 1311

	/* Populate the SG list */
	int_cmd->command_header->opts =
1312 1313
		 __force_bit2int cpu_to_le32(opts | fis_len);
	if (buf_len) {
1314 1315
		command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;

1316 1317 1318 1319 1320 1321
		command_sg->info =
			__force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
		command_sg->dba	=
			__force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
		command_sg->dba_upper =
			__force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1322

1323 1324
		int_cmd->command_header->opts |=
			__force_bit2int cpu_to_le32((1 << 16));
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
	}

	/* Populate the command header */
	int_cmd->command_header->byte_count = 0;

	/* Issue the command to the hardware */
	mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);

	/* Poll if atomic, wait_for_completion otherwise */
	if (atomic == GFP_KERNEL) {
		/* Wait for the command to complete or timeout. */
		if (wait_for_completion_timeout(
				&wait,
				msecs_to_jiffies(timeout)) == 0) {
			dev_err(&port->dd->pdev->dev,
1340 1341 1342
				"Internal command did not complete [%d] "
				"within timeout of  %lu ms\n",
				atomic, timeout);
1343
			if (mtip_check_surprise_removal(port->dd->pdev) ||
A
Asai Thambi S P 已提交
1344
				test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1345 1346 1347 1348
						&port->dd->dd_flag)) {
				rv = -ENXIO;
				goto exec_ic_exit;
			}
1349 1350 1351 1352 1353
			rv = -EAGAIN;
		}
	} else {
		/* Spin for <timeout> checking if command still outstanding */
		timeout = jiffies + msecs_to_jiffies(timeout);
A
Asai Thambi S P 已提交
1354 1355 1356 1357 1358 1359 1360 1361
		while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
				& (1 << MTIP_TAG_INTERNAL))
				&& time_before(jiffies, timeout)) {
			if (mtip_check_surprise_removal(port->dd->pdev)) {
				rv = -ENXIO;
				goto exec_ic_exit;
			}
			if ((fis->command != ATA_CMD_STANDBYNOW1) &&
A
Asai Thambi S P 已提交
1362
				test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1363 1364 1365 1366
						&port->dd->dd_flag)) {
				rv = -ENXIO;
				goto exec_ic_exit;
			}
1367 1368 1369 1370
			if (readl(port->mmio + PORT_IRQ_STAT) & PORT_IRQ_ERR) {
				atomic_inc(&int_cmd->active); /* error */
				break;
			}
1371
		}
1372
	}
1373

1374 1375 1376 1377 1378 1379
	if (atomic_read(&int_cmd->active) > 1) {
		dev_err(&port->dd->pdev->dev,
			"Internal command [%02X] failed\n", fis->command);
		rv = -EIO;
	}
	if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1380
			& (1 << MTIP_TAG_INTERNAL)) {
1381 1382 1383 1384
		rv = -ENXIO;
		if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
					&port->dd->dd_flag)) {
			mtip_restart_port(port);
1385 1386 1387
			rv = -EAGAIN;
		}
	}
1388
exec_ic_exit:
1389 1390 1391
	/* Clear the allocated and active bits for the internal command. */
	atomic_set(&int_cmd->active, 0);
	release_slot(port, MTIP_TAG_INTERNAL);
1392 1393 1394 1395
	if (rv >= 0 && mtip_pause_ncq(port, fis)) {
		/* NCQ paused */
		return rv;
	}
A
Asai Thambi S P 已提交
1396
	clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1397
	wake_up_interruptible(&port->svc_wait);
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445

	return rv;
}

/*
 * Byte-swap ATA ID strings.
 *
 * ATA identify data contains strings in byte-swapped 16-bit words.
 * They must be swapped (on all architectures) to be usable as C strings.
 * This function swaps bytes in-place.
 *
 * @buf The buffer location of the string
 * @len The number of bytes to swap
 *
 * return value
 *	None
 */
static inline void ata_swap_string(u16 *buf, unsigned int len)
{
	int i;
	for (i = 0; i < (len/2); i++)
		be16_to_cpus(&buf[i]);
}

/*
 * Request the device identity information.
 *
 * If a user space buffer is not specified, i.e. is NULL, the
 * identify information is still read from the drive and placed
 * into the identify data buffer (@e port->identify) in the
 * port data structure.
 * When the identify buffer contains valid identify information @e
 * port->identify_valid is non-zero.
 *
 * @port	 Pointer to the port structure.
 * @user_buffer  A user space buffer where the identify data should be
 *                    copied.
 *
 * return value
 *	0	Command completed successfully.
 *	-EFAULT An error occurred while coping data to the user buffer.
 *	-1	Command failed.
 */
static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
{
	int rv = 0;
	struct host_to_dev_fis fis;

A
Asai Thambi S P 已提交
1446
	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1447 1448
		return -EFAULT;

1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
	/* Build the FIS. */
	memset(&fis, 0, sizeof(struct host_to_dev_fis));
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= ATA_CMD_ID_ATA;

	/* Set the identify information as invalid. */
	port->identify_valid = 0;

	/* Clear the identify information. */
	memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);

	/* Execute the command. */
	if (mtip_exec_internal_command(port,
				&fis,
				5,
				port->identify_dma,
				sizeof(u16) * ATA_ID_WORDS,
				0,
				GFP_KERNEL,
				MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
				< 0) {
		rv = -1;
		goto out;
	}

	/*
	 * Perform any necessary byte-swapping.  Yes, the kernel does in fact
	 * perform field-sensitive swapping on the string fields.
	 * See the kernel use of ata_id_string() for proof of this.
	 */
#ifdef __LITTLE_ENDIAN
	ata_swap_string(port->identify + 27, 40);  /* model string*/
	ata_swap_string(port->identify + 23, 8);   /* firmware string*/
	ata_swap_string(port->identify + 10, 20);  /* serial# string*/
#else
	{
		int i;
		for (i = 0; i < ATA_ID_WORDS; i++)
			port->identify[i] = le16_to_cpu(port->identify[i]);
	}
#endif

	/* Set the identify buffer as valid. */
	port->identify_valid = 1;

	if (user_buffer) {
		if (copy_to_user(
			user_buffer,
			port->identify,
			ATA_ID_WORDS * sizeof(u16))) {
			rv = -EFAULT;
			goto out;
		}
	}

out:
	return rv;
}

/*
 * Issue a standby immediate command to the device.
 *
 * @port Pointer to the port structure.
 *
 * return value
 *	0	Command was executed successfully.
 *	-1	An error occurred while executing the command.
 */
static int mtip_standby_immediate(struct mtip_port *port)
{
	int rv;
	struct host_to_dev_fis	fis;
1522
	unsigned long start;
1523 1524 1525 1526 1527 1528 1529

	/* Build the FIS. */
	memset(&fis, 0, sizeof(struct host_to_dev_fis));
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= ATA_CMD_STANDBYNOW1;

1530
	start = jiffies;
1531 1532 1533 1534 1535 1536
	rv = mtip_exec_internal_command(port,
					&fis,
					5,
					0,
					0,
					0,
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
					GFP_ATOMIC,
					15000);
	dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
			jiffies_to_msecs(jiffies - start));
	if (rv)
		dev_warn(&port->dd->pdev->dev,
			"STANDBY IMMEDIATE command failed.\n");

	return rv;
}

/*
 * Issue a READ LOG EXT command to the device.
 *
 * @port	pointer to the port structure.
 * @page	page number to fetch
 * @buffer	pointer to buffer
 * @buffer_dma	dma address corresponding to @buffer
 * @sectors	page length to fetch, in sectors
 *
 * return value
 *	@rv	return value from mtip_exec_internal_command()
 */
static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
				dma_addr_t buffer_dma, unsigned int sectors)
{
	struct host_to_dev_fis fis;

	memset(&fis, 0, sizeof(struct host_to_dev_fis));
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= ATA_CMD_READ_LOG_EXT;
	fis.sect_count	= sectors & 0xFF;
	fis.sect_cnt_ex	= (sectors >> 8) & 0xFF;
	fis.lba_low	= page;
	fis.lba_mid	= 0;
	fis.device	= ATA_DEVICE_OBS;

	memset(buffer, 0, sectors * ATA_SECT_SIZE);

	return mtip_exec_internal_command(port,
					&fis,
					5,
					buffer_dma,
					sectors * ATA_SECT_SIZE,
					0,
					GFP_ATOMIC,
					MTIP_INTERNAL_COMMAND_TIMEOUT_MS);
}

/*
 * Issue a SMART READ DATA command to the device.
 *
 * @port	pointer to the port structure.
 * @buffer	pointer to buffer
 * @buffer_dma	dma address corresponding to @buffer
 *
 * return value
 *	@rv	return value from mtip_exec_internal_command()
 */
static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
					dma_addr_t buffer_dma)
{
	struct host_to_dev_fis fis;

	memset(&fis, 0, sizeof(struct host_to_dev_fis));
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= ATA_CMD_SMART;
	fis.features	= 0xD0;
	fis.sect_count	= 1;
	fis.lba_mid	= 0x4F;
	fis.lba_hi	= 0xC2;
	fis.device	= ATA_DEVICE_OBS;

	return mtip_exec_internal_command(port,
					&fis,
					5,
					buffer_dma,
					ATA_SECT_SIZE,
					0,
					GFP_ATOMIC,
1619
					15000);
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
}

/*
 * Get the value of a smart attribute
 *
 * @port	pointer to the port structure
 * @id		attribute number
 * @attrib	pointer to return attrib information corresponding to @id
 *
 * return value
 *	-EINVAL	NULL buffer passed or unsupported attribute @id.
 *	-EPERM	Identify data not valid, SMART not supported or not enabled
 */
static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
						struct smart_attr *attrib)
{
	int rv, i;
	struct smart_attr *pattr;

	if (!attrib)
		return -EINVAL;

	if (!port->identify_valid) {
		dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
		return -EPERM;
	}
	if (!(port->identify[82] & 0x1)) {
		dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
		return -EPERM;
	}
	if (!(port->identify[85] & 0x1)) {
		dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
		return -EPERM;
	}

	memset(port->smart_buf, 0, ATA_SECT_SIZE);
	rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
	if (rv) {
		dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
		return rv;
	}

	pattr = (struct smart_attr *)(port->smart_buf + 2);
	for (i = 0; i < 29; i++, pattr++)
		if (pattr->attr_id == id) {
			memcpy(attrib, pattr, sizeof(struct smart_attr));
			break;
		}

	if (i == 29) {
		dev_warn(&port->dd->pdev->dev,
			"Query for invalid SMART attribute ID\n");
		rv = -EINVAL;
	}
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687

	return rv;
}

/*
 * Get the drive capacity.
 *
 * @dd      Pointer to the device data structure.
 * @sectors Pointer to the variable that will receive the sector count.
 *
 * return value
 *	1 Capacity was returned successfully.
 *	0 The identify information is invalid.
 */
1688
static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
{
	struct mtip_port *port = dd->port;
	u64 total, raw0, raw1, raw2, raw3;
	raw0 = port->identify[100];
	raw1 = port->identify[101];
	raw2 = port->identify[102];
	raw3 = port->identify[103];
	total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
	*sectors = total;
	return (bool) !!port->identify_valid;
}

/*
 * Reset the HBA.
 *
 * Resets the HBA by setting the HBA Reset bit in the Global
 * HBA Control register. After setting the HBA Reset bit the
 * function waits for 1 second before reading the HBA Reset
 * bit to make sure it has cleared. If HBA Reset is not clear
 * an error is returned. Cannot be used in non-blockable
 * context.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0  The reset was successful.
 *	-1 The HBA Reset bit did not clear.
 */
static int mtip_hba_reset(struct driver_data *dd)
{
	mtip_deinit_port(dd->port);

	/* Set the reset bit */
	writel(HOST_RESET, dd->mmio + HOST_CTL);

	/* Flush */
	readl(dd->mmio + HOST_CTL);

	/* Wait for reset to clear */
	ssleep(1);

	/* Check the bit has cleared */
	if (readl(dd->mmio + HOST_CTL) & HOST_RESET) {
		dev_err(&dd->pdev->dev,
			"Reset bit did not clear.\n");
		return -1;
	}

	return 0;
}

/*
 * Display the identify command data.
 *
 * @port Pointer to the port data structure.
 *
 * return value
 *	None
 */
static void mtip_dump_identify(struct mtip_port *port)
{
	sector_t sectors;
	unsigned short revid;
	char cbuf[42];

	if (!port->identify_valid)
		return;

	strlcpy(cbuf, (char *)(port->identify+10), 21);
	dev_info(&port->dd->pdev->dev,
		"Serial No.: %s\n", cbuf);

	strlcpy(cbuf, (char *)(port->identify+23), 9);
	dev_info(&port->dd->pdev->dev,
		"Firmware Ver.: %s\n", cbuf);

	strlcpy(cbuf, (char *)(port->identify+27), 41);
	dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);

	if (mtip_hw_get_capacity(port->dd, &sectors))
		dev_info(&port->dd->pdev->dev,
			"Capacity: %llu sectors (%llu MB)\n",
			 (u64)sectors,
			 ((u64)sectors) * ATA_SECT_SIZE >> 20);

	pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1775
	switch (revid & 0xFF) {
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
	case 0x1:
		strlcpy(cbuf, "A0", 3);
		break;
	case 0x3:
		strlcpy(cbuf, "A2", 3);
		break;
	default:
		strlcpy(cbuf, "?", 2);
		break;
	}
	dev_info(&port->dd->pdev->dev,
		"Card Type: %s\n", cbuf);
}

/*
 * Map the commands scatter list into the command table.
 *
 * @command Pointer to the command.
 * @nents Number of scatter list entries.
 *
 * return value
 *	None
 */
static inline void fill_command_sg(struct driver_data *dd,
				struct mtip_cmd *command,
				int nents)
{
	int n;
	unsigned int dma_len;
	struct mtip_cmd_sg *command_sg;
	struct scatterlist *sg = command->sg;

	command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;

	for (n = 0; n < nents; n++) {
		dma_len = sg_dma_len(sg);
		if (dma_len > 0x400000)
			dev_err(&dd->pdev->dev,
				"DMA segment length truncated\n");
1815 1816 1817 1818 1819 1820
		command_sg->info = __force_bit2int
			cpu_to_le32((dma_len-1) & 0x3FFFFF);
		command_sg->dba	= __force_bit2int
			cpu_to_le32(sg_dma_address(sg));
		command_sg->dba_upper = __force_bit2int
			cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
		command_sg++;
		sg++;
	}
}

/*
 * @brief Execute a drive command.
 *
 * return value 0 The command completed successfully.
 * return value -1 An error occurred while executing the command.
 */
1832
static int exec_drive_task(struct mtip_port *port, u8 *command)
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
{
	struct host_to_dev_fis	fis;
	struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);

	/* Build the FIS. */
	memset(&fis, 0, sizeof(struct host_to_dev_fis));
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= command[0];
	fis.features	= command[1];
	fis.sect_count	= command[2];
	fis.sector	= command[3];
	fis.cyl_low	= command[4];
	fis.cyl_hi	= command[5];
	fis.device	= command[6] & ~0x10; /* Clear the dev bit*/

1849
	dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
		__func__,
		command[0],
		command[1],
		command[2],
		command[3],
		command[4],
		command[5],
		command[6]);

	/* Execute the command. */
	if (mtip_exec_internal_command(port,
				 &fis,
				 5,
				 0,
				 0,
				 0,
				 GFP_KERNEL,
				 MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
		return -1;
	}

	command[0] = reply->command; /* Status*/
	command[1] = reply->features; /* Error*/
	command[4] = reply->cyl_low;
	command[5] = reply->cyl_hi;

1876
	dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
		__func__,
		command[0],
		command[1],
		command[4],
		command[5]);

	return 0;
}

/*
 * @brief Execute a drive command.
 *
 * @param port Pointer to the port data structure.
 * @param command Pointer to the user specified command parameters.
 * @param user_buffer Pointer to the user space buffer where read sector
 *                   data should be copied.
 *
 * return value 0 The command completed successfully.
 * return value -EFAULT An error occurred while copying the completion
 *                 data to the user space buffer.
 * return value -1 An error occurred while executing the command.
 */
1899 1900
static int exec_drive_command(struct mtip_port *port, u8 *command,
				void __user *user_buffer)
1901 1902
{
	struct host_to_dev_fis	fis;
1903 1904 1905 1906 1907 1908
	struct host_to_dev_fis *reply;
	u8 *buf = NULL;
	dma_addr_t dma_addr = 0;
	int rv = 0, xfer_sz = command[3];

	if (xfer_sz) {
1909
		if (!user_buffer)
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
			return -EFAULT;

		buf = dmam_alloc_coherent(&port->dd->pdev->dev,
				ATA_SECT_SIZE * xfer_sz,
				&dma_addr,
				GFP_KERNEL);
		if (!buf) {
			dev_err(&port->dd->pdev->dev,
				"Memory allocation failed (%d bytes)\n",
				ATA_SECT_SIZE * xfer_sz);
			return -ENOMEM;
		}
		memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
	}
1924 1925 1926

	/* Build the FIS. */
	memset(&fis, 0, sizeof(struct host_to_dev_fis));
1927 1928 1929
	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= command[0];
1930 1931 1932 1933
	fis.features	= command[2];
	fis.sect_count	= command[3];
	if (fis.command == ATA_CMD_SMART) {
		fis.sector	= command[1];
1934 1935
		fis.cyl_low	= 0x4F;
		fis.cyl_hi	= 0xC2;
1936 1937
	}

1938 1939 1940 1941 1942
	if (xfer_sz)
		reply = (port->rxfis + RX_FIS_PIO_SETUP);
	else
		reply = (port->rxfis + RX_FIS_D2H_REG);

1943
	dbg_printk(MTIP_DRV_NAME
1944
		" %s: User Command: cmd %x, sect %x, "
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
		"feat %x, sectcnt %x\n",
		__func__,
		command[0],
		command[1],
		command[2],
		command[3]);

	/* Execute the command. */
	if (mtip_exec_internal_command(port,
				&fis,
				 5,
1956 1957
				 (xfer_sz ? dma_addr : 0),
				 (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1958 1959 1960 1961
				 0,
				 GFP_KERNEL,
				 MTIP_IOCTL_COMMAND_TIMEOUT_MS)
				 < 0) {
1962 1963
		rv = -EFAULT;
		goto exit_drive_command;
1964 1965 1966 1967 1968
	}

	/* Collect the completion status. */
	command[0] = reply->command; /* Status*/
	command[1] = reply->features; /* Error*/
1969
	command[2] = reply->sect_count;
1970 1971

	dbg_printk(MTIP_DRV_NAME
1972
		" %s: Completion Status: stat %x, "
1973
		"err %x, nsect %x\n",
1974 1975 1976 1977 1978
		__func__,
		command[0],
		command[1],
		command[2]);

1979
	if (xfer_sz) {
1980
		if (copy_to_user(user_buffer,
1981
				 buf,
1982
				 ATA_SECT_SIZE * command[3])) {
1983 1984
			rv = -EFAULT;
			goto exit_drive_command;
1985 1986
		}
	}
1987 1988 1989 1990 1991
exit_drive_command:
	if (buf)
		dmam_free_coherent(&port->dd->pdev->dev,
				ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
	return rv;
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
}

/*
 *  Indicates whether a command has a single sector payload.
 *
 *  @command passed to the device to perform the certain event.
 *  @features passed to the device to perform the certain event.
 *
 *  return value
 *	1	command is one that always has a single sector payload,
 *		regardless of the value in the Sector Count field.
 *      0       otherwise
 *
 */
static unsigned int implicit_sector(unsigned char command,
				    unsigned char features)
{
	unsigned int rv = 0;

	/* list of commands that have an implicit sector count of 1 */
	switch (command) {
2013 2014 2015 2016 2017 2018 2019 2020
	case ATA_CMD_SEC_SET_PASS:
	case ATA_CMD_SEC_UNLOCK:
	case ATA_CMD_SEC_ERASE_PREP:
	case ATA_CMD_SEC_ERASE_UNIT:
	case ATA_CMD_SEC_FREEZE_LOCK:
	case ATA_CMD_SEC_DISABLE_PASS:
	case ATA_CMD_PMP_READ:
	case ATA_CMD_PMP_WRITE:
2021 2022
		rv = 1;
		break;
2023 2024
	case ATA_CMD_SET_MAX:
		if (features == ATA_SET_MAX_UNLOCK)
2025 2026
			rv = 1;
		break;
2027 2028 2029
	case ATA_CMD_SMART:
		if ((features == ATA_SMART_READ_VALUES) ||
				(features == ATA_SMART_READ_THRESHOLDS))
2030 2031
			rv = 1;
		break;
2032 2033 2034
	case ATA_CMD_CONF_OVERLAY:
		if ((features == ATA_DCO_IDENTIFY) ||
				(features == ATA_DCO_SET))
2035 2036 2037 2038 2039
			rv = 1;
		break;
	}
	return rv;
}
2040 2041 2042
static void mtip_set_timeout(struct driver_data *dd,
					struct host_to_dev_fis *fis,
					unsigned int *timeout, u8 erasemode)
2043 2044 2045 2046 2047 2048 2049
{
	switch (fis->command) {
	case ATA_CMD_DOWNLOAD_MICRO:
		*timeout = 120000; /* 2 minutes */
		break;
	case ATA_CMD_SEC_ERASE_UNIT:
	case 0xFC:
2050 2051 2052 2053
		if (erasemode)
			*timeout = ((*(dd->port->identify + 90) * 2) * 60000);
		else
			*timeout = ((*(dd->port->identify + 89) * 2) * 60000);
2054 2055
		break;
	case ATA_CMD_STANDBYNOW1:
2056
		*timeout = 120000;  /* 2 minutes */
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
		break;
	case 0xF7:
	case 0xFA:
		*timeout = 60000;  /* 60 seconds */
		break;
	case ATA_CMD_SMART:
		*timeout = 15000;  /* 15 seconds */
		break;
	default:
		*timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
		break;
	}
}

2071 2072 2073 2074 2075
/*
 * Executes a taskfile
 * See ide_taskfile_ioctl() for derivation
 */
static int exec_drive_taskfile(struct driver_data *dd,
2076 2077 2078
			       void __user *buf,
			       ide_task_request_t *req_task,
			       int outtotal)
2079 2080 2081 2082 2083
{
	struct host_to_dev_fis	fis;
	struct host_to_dev_fis *reply;
	u8 *outbuf = NULL;
	u8 *inbuf = NULL;
2084 2085 2086
	dma_addr_t outbuf_dma = 0;
	dma_addr_t inbuf_dma = 0;
	dma_addr_t dma_buffer = 0;
2087 2088 2089 2090
	int err = 0;
	unsigned int taskin = 0;
	unsigned int taskout = 0;
	u8 nsect = 0;
2091
	unsigned int timeout;
2092 2093 2094
	unsigned int force_single_sector;
	unsigned int transfer_size;
	unsigned long task_file_data;
2095
	int intotal = outtotal + req_task->out_size;
2096
	int erasemode = 0;
2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119

	taskout = req_task->out_size;
	taskin = req_task->in_size;
	/* 130560 = 512 * 0xFF*/
	if (taskin > 130560 || taskout > 130560) {
		err = -EINVAL;
		goto abort;
	}

	if (taskout) {
		outbuf = kzalloc(taskout, GFP_KERNEL);
		if (outbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}
		if (copy_from_user(outbuf, buf + outtotal, taskout)) {
			err = -EFAULT;
			goto abort;
		}
		outbuf_dma = pci_map_single(dd->pdev,
					 outbuf,
					 taskout,
					 DMA_TO_DEVICE);
2120
		if (outbuf_dma == 0) {
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140
			err = -ENOMEM;
			goto abort;
		}
		dma_buffer = outbuf_dma;
	}

	if (taskin) {
		inbuf = kzalloc(taskin, GFP_KERNEL);
		if (inbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}

		if (copy_from_user(inbuf, buf + intotal, taskin)) {
			err = -EFAULT;
			goto abort;
		}
		inbuf_dma = pci_map_single(dd->pdev,
					 inbuf,
					 taskin, DMA_FROM_DEVICE);
2141
		if (inbuf_dma == 0) {
2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
			err = -ENOMEM;
			goto abort;
		}
		dma_buffer = inbuf_dma;
	}

	/* only supports PIO and non-data commands from this ioctl. */
	switch (req_task->data_phase) {
	case TASKFILE_OUT:
		nsect = taskout / ATA_SECT_SIZE;
		reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
		break;
	case TASKFILE_IN:
		reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
		break;
	case TASKFILE_NO_DATA:
		reply = (dd->port->rxfis + RX_FIS_D2H_REG);
		break;
	default:
		err = -EINVAL;
		goto abort;
	}

	/* Build the FIS. */
	memset(&fis, 0, sizeof(struct host_to_dev_fis));

	fis.type	= 0x27;
	fis.opts	= 1 << 7;
	fis.command	= req_task->io_ports[7];
	fis.features	= req_task->io_ports[1];
	fis.sect_count	= req_task->io_ports[2];
	fis.lba_low	= req_task->io_ports[3];
	fis.lba_mid	= req_task->io_ports[4];
	fis.lba_hi	= req_task->io_ports[5];
	 /* Clear the dev bit*/
	fis.device	= req_task->io_ports[6] & ~0x10;

	if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
		req_task->in_flags.all	=
			IDE_TASKFILE_STD_IN_FLAGS |
			(IDE_HOB_STD_IN_FLAGS << 8);
		fis.lba_low_ex		= req_task->hob_ports[3];
		fis.lba_mid_ex		= req_task->hob_ports[4];
		fis.lba_hi_ex		= req_task->hob_ports[5];
		fis.features_ex		= req_task->hob_ports[1];
		fis.sect_cnt_ex		= req_task->hob_ports[2];

	} else {
		req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
	}

	force_single_sector = implicit_sector(fis.command, fis.features);

	if ((taskin || taskout) && (!fis.sect_count)) {
		if (nsect)
			fis.sect_count = nsect;
		else {
			if (!force_single_sector) {
				dev_warn(&dd->pdev->dev,
					"data movement but "
					"sect_count is 0\n");
					err = -EINVAL;
					goto abort;
			}
		}
	}

	dbg_printk(MTIP_DRV_NAME
2210
		" %s: cmd %x, feat %x, nsect %x,"
2211 2212
		" sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
		" head/dev %x\n",
2213
		__func__,
2214 2215 2216 2217 2218 2219 2220 2221
		fis.command,
		fis.features,
		fis.sect_count,
		fis.lba_low,
		fis.lba_mid,
		fis.lba_hi,
		fis.device);

2222
	/* check for erase mode support during secure erase.*/
2223 2224
	if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
					(outbuf[0] & MTIP_SEC_ERASE_MODE)) {
2225 2226 2227 2228
		erasemode = 1;
	}

	mtip_set_timeout(dd, &fis, &timeout, erasemode);
2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265

	/* Determine the correct transfer size.*/
	if (force_single_sector)
		transfer_size = ATA_SECT_SIZE;
	else
		transfer_size = ATA_SECT_SIZE * fis.sect_count;

	/* Execute the command.*/
	if (mtip_exec_internal_command(dd->port,
				 &fis,
				 5,
				 dma_buffer,
				 transfer_size,
				 0,
				 GFP_KERNEL,
				 timeout) < 0) {
		err = -EIO;
		goto abort;
	}

	task_file_data = readl(dd->port->mmio+PORT_TFDATA);

	if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
		reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
		req_task->io_ports[7] = reply->control;
	} else {
		reply = dd->port->rxfis + RX_FIS_D2H_REG;
		req_task->io_ports[7] = reply->command;
	}

	/* reclaim the DMA buffers.*/
	if (inbuf_dma)
		pci_unmap_single(dd->pdev, inbuf_dma,
			taskin, DMA_FROM_DEVICE);
	if (outbuf_dma)
		pci_unmap_single(dd->pdev, outbuf_dma,
			taskout, DMA_TO_DEVICE);
2266 2267
	inbuf_dma  = 0;
	outbuf_dma = 0;
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285

	/* return the ATA registers to the caller.*/
	req_task->io_ports[1] = reply->features;
	req_task->io_ports[2] = reply->sect_count;
	req_task->io_ports[3] = reply->lba_low;
	req_task->io_ports[4] = reply->lba_mid;
	req_task->io_ports[5] = reply->lba_hi;
	req_task->io_ports[6] = reply->device;

	if (req_task->out_flags.all & 1)  {

		req_task->hob_ports[3] = reply->lba_low_ex;
		req_task->hob_ports[4] = reply->lba_mid_ex;
		req_task->hob_ports[5] = reply->lba_hi_ex;
		req_task->hob_ports[1] = reply->features_ex;
		req_task->hob_ports[2] = reply->sect_cnt_ex;
	}
	dbg_printk(MTIP_DRV_NAME
2286
		" %s: Completion: stat %x,"
2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
		"err %x, sect_cnt %x, lbalo %x,"
		"lbamid %x, lbahi %x, dev %x\n",
		__func__,
		req_task->io_ports[7],
		req_task->io_ports[1],
		req_task->io_ports[2],
		req_task->io_ports[3],
		req_task->io_ports[4],
		req_task->io_ports[5],
		req_task->io_ports[6]);

	if (taskout) {
		if (copy_to_user(buf + outtotal, outbuf, taskout)) {
			err = -EFAULT;
			goto abort;
		}
	}
	if (taskin) {
		if (copy_to_user(buf + intotal, inbuf, taskin)) {
			err = -EFAULT;
			goto abort;
		}
	}
abort:
	if (inbuf_dma)
		pci_unmap_single(dd->pdev, inbuf_dma,
					taskin, DMA_FROM_DEVICE);
	if (outbuf_dma)
		pci_unmap_single(dd->pdev, outbuf_dma,
					taskout, DMA_TO_DEVICE);
	kfree(outbuf);
	kfree(inbuf);

	return err;
}

/*
 * Handle IOCTL calls from the Block Layer.
 *
 * This function is called by the Block Layer when it receives an IOCTL
 * command that it does not understand. If the IOCTL command is not supported
 * this function returns -ENOTTY.
 *
 * @dd  Pointer to the driver data structure.
 * @cmd IOCTL command passed from the Block Layer.
 * @arg IOCTL argument passed from the Block Layer.
 *
 * return value
 *	0	The IOCTL completed successfully.
 *	-ENOTTY The specified command is not supported.
 *	-EFAULT An error occurred copying data to a user space buffer.
 *	-EIO	An error occurred while executing the command.
 */
2340 2341
static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
			 unsigned long arg)
2342 2343 2344
{
	switch (cmd) {
	case HDIO_GET_IDENTITY:
2345 2346 2347 2348
	{
		if (copy_to_user((void __user *)arg, dd->port->identify,
						sizeof(u16) * ATA_ID_WORDS))
			return -EFAULT;
2349
		break;
2350
	}
2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
	case HDIO_DRIVE_CMD:
	{
		u8 drive_command[4];

		/* Copy the user command info to our buffer. */
		if (copy_from_user(drive_command,
					 (void __user *) arg,
					 sizeof(drive_command)))
			return -EFAULT;

		/* Execute the drive command. */
		if (exec_drive_command(dd->port,
					 drive_command,
					 (void __user *) (arg+4)))
			return -EIO;

		/* Copy the status back to the users buffer. */
		if (copy_to_user((void __user *) arg,
					 drive_command,
					 sizeof(drive_command)))
			return -EFAULT;

		break;
	}
	case HDIO_DRIVE_TASK:
	{
		u8 drive_command[7];

		/* Copy the user command info to our buffer. */
		if (copy_from_user(drive_command,
					 (void __user *) arg,
					 sizeof(drive_command)))
			return -EFAULT;

		/* Execute the drive command. */
		if (exec_drive_task(dd->port, drive_command))
			return -EIO;

		/* Copy the status back to the users buffer. */
		if (copy_to_user((void __user *) arg,
					 drive_command,
					 sizeof(drive_command)))
			return -EFAULT;

		break;
	}
2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409
	case HDIO_DRIVE_TASKFILE: {
		ide_task_request_t req_task;
		int ret, outtotal;

		if (copy_from_user(&req_task, (void __user *) arg,
					sizeof(req_task)))
			return -EFAULT;

		outtotal = sizeof(req_task);

		ret = exec_drive_taskfile(dd, (void __user *) arg,
						&req_task, outtotal);

2410 2411
		if (copy_to_user((void __user *) arg, &req_task,
							sizeof(req_task)))
2412 2413 2414 2415
			return -EFAULT;

		return ret;
	}
2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443

	default:
		return -EINVAL;
	}
	return 0;
}

/*
 * Submit an IO to the hw
 *
 * This function is called by the block layer to issue an io
 * to the device. Upon completion, the callback function will
 * be called with the data parameter passed as the callback data.
 *
 * @dd       Pointer to the driver data structure.
 * @start    First sector to read.
 * @nsect    Number of sectors to read.
 * @nents    Number of entries in scatter list for the read command.
 * @tag      The tag of this read command.
 * @callback Pointer to the function that should be called
 *	     when the read completes.
 * @data     Callback data passed to the callback function
 *	     when the read completes.
 * @dir      Direction (read or write)
 *
 * return value
 *	None
 */
2444
static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
2445
			      int nsect, int nents, int tag, void *callback,
2446
			      void *data, int dir)
2447 2448 2449 2450
{
	struct host_to_dev_fis	*fis;
	struct mtip_port *port = dd->port;
	struct mtip_cmd *command = &port->commands[tag];
2451
	int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2452
	u64 start = sector;
2453 2454

	/* Map the scatter list for DMA access */
2455
	nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470

	command->scatter_ents = nents;

	/*
	 * The number of retries for this command before it is
	 * reported as a failure to the upper layers.
	 */
	command->retries = MTIP_MAX_RETRIES;

	/* Fill out fis */
	fis = command->command;
	fis->type        = 0x27;
	fis->opts        = 1 << 7;
	fis->command     =
		(dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2471 2472 2473 2474 2475 2476
	fis->lba_low     = start & 0xFF;
	fis->lba_mid     = (start >> 8) & 0xFF;
	fis->lba_hi      = (start >> 16) & 0xFF;
	fis->lba_low_ex  = (start >> 24) & 0xFF;
	fis->lba_mid_ex  = (start >> 32) & 0xFF;
	fis->lba_hi_ex   = (start >> 40) & 0xFF;
2477
	fis->device	 = 1 << 6;
2478 2479
	fis->features    = nsect & 0xFF;
	fis->features_ex = (nsect >> 8) & 0xFF;
2480 2481 2482 2483 2484 2485 2486 2487
	fis->sect_count  = ((tag << 3) | (tag >> 5));
	fis->sect_cnt_ex = 0;
	fis->control     = 0;
	fis->res2        = 0;
	fis->res3        = 0;
	fill_command_sg(dd, command, nents);

	/* Populate the command header */
2488 2489 2490
	command->command_header->opts =
			__force_bit2int cpu_to_le32(
				(nents << 16) | 5 | AHCI_CMD_PREFETCH);
2491 2492 2493 2494 2495 2496 2497 2498
	command->command_header->byte_count = 0;

	/*
	 * Set the completion function and data for the command
	 * within this layer.
	 */
	command->comp_data = dd;
	command->comp_func = mtip_async_complete;
2499
	command->direction = dma_dir;
2500 2501 2502 2503 2504 2505 2506 2507 2508

	/*
	 * Set the completion function and data for the command passed
	 * from the upper layer.
	 */
	command->async_data = data;
	command->async_callback = callback;

	/*
2509 2510
	 * To prevent this command from being issued
	 * if an internal command is in progress or error handling is active.
2511
	 */
2512
	if (port->flags & MTIP_PF_PAUSE_IO) {
2513
		set_bit(tag, port->cmds_to_issue);
A
Asai Thambi S P 已提交
2514
		set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2515 2516
		return;
	}
2517 2518 2519 2520

	/* Issue the command to the hardware */
	mtip_issue_ncq_command(port, tag);

2521
	return;
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532
}

/*
 * Release a command slot.
 *
 * @dd  Pointer to the driver data structure.
 * @tag Slot tag
 *
 * return value
 *      None
 */
2533
static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548
{
	release_slot(dd->port, tag);
}

/*
 * Obtain a command slot and return its associated scatter list.
 *
 * @dd  Pointer to the driver data structure.
 * @tag Pointer to an int that will receive the allocated command
 *            slot tag.
 *
 * return value
 *	Pointer to the scatter list for the allocated command slot
 *	or NULL if no command slots are available.
 */
2549 2550
static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
						   int *tag)
2551 2552 2553 2554 2555 2556 2557 2558 2559
{
	/*
	 * It is possible that, even with this semaphore, a thread
	 * may think that no command slots are available. Therefore, we
	 * need to make an attempt to get_slot().
	 */
	down(&dd->port->cmd_slot);
	*tag = get_slot(dd->port);

A
Asai Thambi S P 已提交
2560
	if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2561 2562 2563
		up(&dd->port->cmd_slot);
		return NULL;
	}
2564 2565
	if (unlikely(*tag < 0)) {
		up(&dd->port->cmd_slot);
2566
		return NULL;
2567
	}
2568 2569 2570 2571 2572

	return dd->port->commands[*tag].sg;
}

/*
2573
 * Sysfs status dump.
2574 2575 2576 2577 2578 2579 2580 2581
 *
 * @dev  Pointer to the device structure, passed by the kernrel.
 * @attr Pointer to the device_attribute structure passed by the kernel.
 * @buf  Pointer to the char buffer that will receive the stats info.
 *
 * return value
 *	The size, in bytes, of the data copied into buf.
 */
2582 2583 2584 2585 2586 2587 2588
static ssize_t mtip_hw_show_status(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	struct driver_data *dd = dev_to_disk(dev)->private_data;
	int size = 0;

A
Asai Thambi S P 已提交
2589
	if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2590
		size += sprintf(buf, "%s", "thermal_shutdown\n");
A
Asai Thambi S P 已提交
2591
	else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2592 2593 2594 2595 2596 2597 2598 2599
		size += sprintf(buf, "%s", "write_protect\n");
	else
		size += sprintf(buf, "%s", "online\n");

	return size;
}

static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2600

2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708
static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
				  size_t len, loff_t *offset)
{
	struct driver_data *dd =  (struct driver_data *)f->private_data;
	char buf[MTIP_DFS_MAX_BUF_SIZE];
	u32 group_allocated;
	int size = *offset;
	int n;

	if (!len || size)
		return 0;

	size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");

	for (n = dd->slot_groups-1; n >= 0; n--)
		size += sprintf(&buf[size], "%08X ",
					 readl(dd->port->s_active[n]));

	size += sprintf(&buf[size], "]\n");
	size += sprintf(&buf[size], "H/ Command Issue : [ 0x");

	for (n = dd->slot_groups-1; n >= 0; n--)
		size += sprintf(&buf[size], "%08X ",
					readl(dd->port->cmd_issue[n]));

	size += sprintf(&buf[size], "]\n");
	size += sprintf(&buf[size], "H/ Completed     : [ 0x");

	for (n = dd->slot_groups-1; n >= 0; n--)
		size += sprintf(&buf[size], "%08X ",
				readl(dd->port->completed[n]));

	size += sprintf(&buf[size], "]\n");
	size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
				readl(dd->port->mmio + PORT_IRQ_STAT));
	size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
				readl(dd->mmio + HOST_IRQ_STAT));
	size += sprintf(&buf[size], "\n");

	size += sprintf(&buf[size], "L/ Allocated     : [ 0x");

	for (n = dd->slot_groups-1; n >= 0; n--) {
		if (sizeof(long) > sizeof(u32))
			group_allocated =
				dd->port->allocated[n/2] >> (32*(n&1));
		else
			group_allocated = dd->port->allocated[n];
		size += sprintf(&buf[size], "%08X ", group_allocated);
	}
	size += sprintf(&buf[size], "]\n");

	size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");

	for (n = dd->slot_groups-1; n >= 0; n--) {
		if (sizeof(long) > sizeof(u32))
			group_allocated =
				dd->port->cmds_to_issue[n/2] >> (32*(n&1));
		else
			group_allocated = dd->port->cmds_to_issue[n];
		size += sprintf(&buf[size], "%08X ", group_allocated);
	}
	size += sprintf(&buf[size], "]\n");

	*offset = size <= len ? size : len;
	size = copy_to_user(ubuf, buf, *offset);
	if (size)
		return -EFAULT;

	return *offset;
}

static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
				  size_t len, loff_t *offset)
{
	struct driver_data *dd =  (struct driver_data *)f->private_data;
	char buf[MTIP_DFS_MAX_BUF_SIZE];
	int size = *offset;

	if (!len || size)
		return 0;

	size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
							dd->port->flags);
	size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
							dd->dd_flag);

	*offset = size <= len ? size : len;
	size = copy_to_user(ubuf, buf, *offset);
	if (size)
		return -EFAULT;

	return *offset;
}

static const struct file_operations mtip_regs_fops = {
	.owner  = THIS_MODULE,
	.open   = simple_open,
	.read   = mtip_hw_read_registers,
	.llseek = no_llseek,
};

static const struct file_operations mtip_flags_fops = {
	.owner  = THIS_MODULE,
	.open   = simple_open,
	.read   = mtip_hw_read_flags,
	.llseek = no_llseek,
};

2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
/*
 * Create the sysfs related attributes.
 *
 * @dd   Pointer to the driver data structure.
 * @kobj Pointer to the kobj for the block device.
 *
 * return value
 *	0	Operation completed successfully.
 *	-EINVAL Invalid parameter.
 */
2719
static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2720 2721 2722 2723
{
	if (!kobj || !dd)
		return -EINVAL;

2724 2725 2726
	if (sysfs_create_file(kobj, &dev_attr_status.attr))
		dev_warn(&dd->pdev->dev,
			"Error creating 'status' sysfs entry\n");
2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
	return 0;
}

/*
 * Remove the sysfs related attributes.
 *
 * @dd   Pointer to the driver data structure.
 * @kobj Pointer to the kobj for the block device.
 *
 * return value
 *	0	Operation completed successfully.
 *	-EINVAL Invalid parameter.
 */
2740
static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2741 2742 2743 2744
{
	if (!kobj || !dd)
		return -EINVAL;

2745
	sysfs_remove_file(kobj, &dev_attr_status.attr);
2746 2747 2748 2749

	return 0;
}

2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777
static int mtip_hw_debugfs_init(struct driver_data *dd)
{
	if (!dfs_parent)
		return -1;

	dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
	if (IS_ERR_OR_NULL(dd->dfs_node)) {
		dev_warn(&dd->pdev->dev,
			"Error creating node %s under debugfs\n",
						dd->disk->disk_name);
		dd->dfs_node = NULL;
		return -1;
	}

	debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
							&mtip_flags_fops);
	debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
							&mtip_regs_fops);

	return 0;
}

static void mtip_hw_debugfs_exit(struct driver_data *dd)
{
	debugfs_remove_recursive(dd->dfs_node);
}


2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868
/*
 * Perform any init/resume time hardware setup
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	None
 */
static inline void hba_setup(struct driver_data *dd)
{
	u32 hwdata;
	hwdata = readl(dd->mmio + HOST_HSORG);

	/* interrupt bug workaround: use only 1 IS bit.*/
	writel(hwdata |
		HSORG_DISABLE_SLOTGRP_INTR |
		HSORG_DISABLE_SLOTGRP_PXIS,
		dd->mmio + HOST_HSORG);
}

/*
 * Detect the details of the product, and store anything needed
 * into the driver data structure.  This includes product type and
 * version and number of slot groups.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	None
 */
static void mtip_detect_product(struct driver_data *dd)
{
	u32 hwdata;
	unsigned int rev, slotgroups;

	/*
	 * HBA base + 0xFC [15:0] - vendor-specific hardware interface
	 * info register:
	 * [15:8] hardware/software interface rev#
	 * [   3] asic-style interface
	 * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
	 */
	hwdata = readl(dd->mmio + HOST_HSORG);

	dd->product_type = MTIP_PRODUCT_UNKNOWN;
	dd->slot_groups = 1;

	if (hwdata & 0x8) {
		dd->product_type = MTIP_PRODUCT_ASICFPGA;
		rev = (hwdata & HSORG_HWREV) >> 8;
		slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
		dev_info(&dd->pdev->dev,
			"ASIC-FPGA design, HS rev 0x%x, "
			"%i slot groups [%i slots]\n",
			 rev,
			 slotgroups,
			 slotgroups * 32);

		if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
			dev_warn(&dd->pdev->dev,
				"Warning: driver only supports "
				"%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
			slotgroups = MTIP_MAX_SLOT_GROUPS;
		}
		dd->slot_groups = slotgroups;
		return;
	}

	dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
}

/*
 * Blocking wait for FTL rebuild to complete
 *
 * @dd Pointer to the DRIVER_DATA structure.
 *
 * return value
 *	0	FTL rebuild completed successfully
 *	-EFAULT FTL rebuild error/timeout/interruption
 */
static int mtip_ftl_rebuild_poll(struct driver_data *dd)
{
	unsigned long timeout, cnt = 0, start;

	dev_warn(&dd->pdev->dev,
		"FTL rebuild in progress. Polling for completion.\n");

	start = jiffies;
	timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);

	do {
A
Asai Thambi S P 已提交
2869
		if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2870 2871
				&dd->dd_flag)))
			return -EFAULT;
2872 2873
		if (mtip_check_surprise_removal(dd->pdev))
			return -EFAULT;
2874

2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891
		if (mtip_get_identify(dd->port, NULL) < 0)
			return -EFAULT;

		if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
			MTIP_FTL_REBUILD_MAGIC) {
			ssleep(1);
			/* Print message every 3 minutes */
			if (cnt++ >= 180) {
				dev_warn(&dd->pdev->dev,
				"FTL rebuild in progress (%d secs).\n",
				jiffies_to_msecs(jiffies - start) / 1000);
				cnt = 0;
			}
		} else {
			dev_warn(&dd->pdev->dev,
				"FTL rebuild complete (%d secs).\n",
			jiffies_to_msecs(jiffies - start) / 1000);
2892
			mtip_block_initialize(dd);
2893
			return 0;
2894 2895 2896 2897 2898
		}
		ssleep(10);
	} while (time_before(jiffies, timeout));

	/* Check for timeout */
2899
	dev_err(&dd->pdev->dev,
2900 2901
		"Timed out waiting for FTL rebuild to complete (%d secs).\n",
		jiffies_to_msecs(jiffies - start) / 1000);
2902
	return -EFAULT;
2903 2904
}

2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
/*
 * service thread to issue queued commands
 *
 * @data Pointer to the driver data structure.
 *
 * return value
 *	0
 */

static int mtip_service_thread(void *data)
{
	struct driver_data *dd = (struct driver_data *)data;
	unsigned long slot, slot_start, slot_wrap;
	unsigned int num_cmd_slots = dd->slot_groups * 32;
	struct mtip_port *port = dd->port;

	while (1) {
		/*
		 * the condition is to check neither an internal command is
		 * is in progress nor error handling is active
		 */
		wait_event_interruptible(port->svc_wait, (port->flags) &&
2927
			!(port->flags & MTIP_PF_PAUSE_IO));
2928 2929 2930 2931

		if (kthread_should_stop())
			break;

A
Asai Thambi S P 已提交
2932
		if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2933 2934
				&dd->dd_flag)))
			break;
2935

A
Asai Thambi S P 已提交
2936 2937
		set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
		if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964
			slot = 1;
			/* used to restrict the loop to one iteration */
			slot_start = num_cmd_slots;
			slot_wrap = 0;
			while (1) {
				slot = find_next_bit(port->cmds_to_issue,
						num_cmd_slots, slot);
				if (slot_wrap == 1) {
					if ((slot_start >= slot) ||
						(slot >= num_cmd_slots))
						break;
				}
				if (unlikely(slot_start == num_cmd_slots))
					slot_start = slot;

				if (unlikely(slot == num_cmd_slots)) {
					slot = 1;
					slot_wrap = 1;
					continue;
				}

				/* Issue the command to the hardware */
				mtip_issue_ncq_command(port, slot);

				clear_bit(slot, port->cmds_to_issue);
			}

A
Asai Thambi S P 已提交
2965 2966
			clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
		} else if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
A
Asai Thambi S P 已提交
2967
			if (!mtip_ftl_rebuild_poll(dd))
A
Asai Thambi S P 已提交
2968
				set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
A
Asai Thambi S P 已提交
2969
							&dd->dd_flag);
A
Asai Thambi S P 已提交
2970
			clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2971
		}
A
Asai Thambi S P 已提交
2972
		clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2973

2974
		if (test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2975
			break;
2976 2977 2978 2979
	}
	return 0;
}

2980 2981 2982 2983 2984 2985 2986 2987
/*
 * Called once for each card.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0 on success, else an error code.
 */
2988
static int mtip_hw_init(struct driver_data *dd)
2989 2990 2991 2992
{
	int i;
	int rv;
	unsigned int num_command_slots;
2993
	unsigned long timeout, timetaken;
2994 2995
	unsigned char *buf;
	struct smart_attr attr242;
2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029

	dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];

	mtip_detect_product(dd);
	if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
		rv = -EIO;
		goto out1;
	}
	num_command_slots = dd->slot_groups * 32;

	hba_setup(dd);

	tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);

	dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
	if (!dd->port) {
		dev_err(&dd->pdev->dev,
			"Memory allocation: port structure\n");
		return -ENOMEM;
	}

	/* Counting semaphore to track command slot usage */
	sema_init(&dd->port->cmd_slot, num_command_slots - 1);

	/* Spinlock to prevent concurrent issue */
	spin_lock_init(&dd->port->cmd_issue_lock);

	/* Set the port mmio base address. */
	dd->port->mmio	= dd->mmio + PORT_OFFSET;
	dd->port->dd	= dd;

	/* Allocate memory for the command list. */
	dd->port->command_list =
		dmam_alloc_coherent(&dd->pdev->dev,
3030
			HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
			&dd->port->command_list_dma,
			GFP_KERNEL);
	if (!dd->port->command_list) {
		dev_err(&dd->pdev->dev,
			"Memory allocation: command list\n");
		rv = -ENOMEM;
		goto out1;
	}

	/* Clear the memory we have allocated. */
	memset(dd->port->command_list,
		0,
3043
		HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4));
3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058

	/* Setup the addresse of the RX FIS. */
	dd->port->rxfis	    = dd->port->command_list + HW_CMD_SLOT_SZ;
	dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;

	/* Setup the address of the command tables. */
	dd->port->command_table	  = dd->port->rxfis + AHCI_RX_FIS_SZ;
	dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;

	/* Setup the address of the identify data. */
	dd->port->identify     = dd->port->command_table +
					HW_CMD_TBL_AR_SZ;
	dd->port->identify_dma = dd->port->command_tbl_dma +
					HW_CMD_TBL_AR_SZ;

3059
	/* Setup the address of the sector buffer - for some non-ncq cmds */
3060 3061 3062
	dd->port->sector_buffer	= (void *) dd->port->identify + ATA_SECT_SIZE;
	dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;

3063 3064 3065 3066 3067 3068 3069 3070 3071
	/* Setup the address of the log buf - for read log command */
	dd->port->log_buf = (void *)dd->port->sector_buffer  + ATA_SECT_SIZE;
	dd->port->log_buf_dma = dd->port->sector_buffer_dma + ATA_SECT_SIZE;

	/* Setup the address of the smart buf - for smart read data command */
	dd->port->smart_buf = (void *)dd->port->log_buf  + ATA_SECT_SIZE;
	dd->port->smart_buf_dma = dd->port->log_buf_dma + ATA_SECT_SIZE;


3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087
	/* Point the command headers at the command tables. */
	for (i = 0; i < num_command_slots; i++) {
		dd->port->commands[i].command_header =
					dd->port->command_list +
					(sizeof(struct mtip_cmd_hdr) * i);
		dd->port->commands[i].command_header_dma =
					dd->port->command_list_dma +
					(sizeof(struct mtip_cmd_hdr) * i);

		dd->port->commands[i].command =
			dd->port->command_table + (HW_CMD_TBL_SZ * i);
		dd->port->commands[i].command_dma =
			dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);

		if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
			dd->port->commands[i].command_header->ctbau =
3088
			__force_bit2int cpu_to_le32(
3089
			(dd->port->commands[i].command_dma >> 16) >> 16);
3090 3091 3092
		dd->port->commands[i].command_header->ctba =
			__force_bit2int cpu_to_le32(
			dd->port->commands[i].command_dma & 0xFFFFFFFF);
3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114

		/*
		 * If this is not done, a bug is reported by the stock
		 * FC11 i386. Due to the fact that it has lots of kernel
		 * debugging enabled.
		 */
		sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);

		/* Mark all commands as currently inactive.*/
		atomic_set(&dd->port->commands[i].active, 0);
	}

	/* Setup the pointers to the extended s_active and CI registers. */
	for (i = 0; i < dd->slot_groups; i++) {
		dd->port->s_active[i] =
			dd->port->mmio + i*0x80 + PORT_SCR_ACT;
		dd->port->cmd_issue[i] =
			dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
		dd->port->completed[i] =
			dd->port->mmio + i*0x80 + PORT_SDBV;
	}

3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128
	timetaken = jiffies;
	timeout = jiffies + msecs_to_jiffies(30000);
	while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
		 time_before(jiffies, timeout)) {
		mdelay(100);
	}
	if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
		timetaken = jiffies - timetaken;
		dev_warn(&dd->pdev->dev,
			"Surprise removal detected at %u ms\n",
			jiffies_to_msecs(timetaken));
		rv = -ENODEV;
		goto out2 ;
	}
A
Asai Thambi S P 已提交
3129
	if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3130 3131 3132 3133 3134
		timetaken = jiffies - timetaken;
		dev_warn(&dd->pdev->dev,
			"Removal detected at %u ms\n",
			jiffies_to_msecs(timetaken));
		rv = -EFAULT;
3135 3136 3137
		goto out2;
	}

3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151
	/* Conditionally reset the HBA. */
	if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
		if (mtip_hba_reset(dd) < 0) {
			dev_err(&dd->pdev->dev,
				"Card did not reset within timeout\n");
			rv = -EIO;
			goto out2;
		}
	} else {
		/* Clear any pending interrupts on the HBA */
		writel(readl(dd->mmio + HOST_IRQ_STAT),
			dd->mmio + HOST_IRQ_STAT);
	}

3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173
	mtip_init_port(dd->port);
	mtip_start_port(dd->port);

	/* Setup the ISR and enable interrupts. */
	rv = devm_request_irq(&dd->pdev->dev,
				dd->pdev->irq,
				mtip_irq_handler,
				IRQF_SHARED,
				dev_driver_string(&dd->pdev->dev),
				dd);

	if (rv) {
		dev_err(&dd->pdev->dev,
			"Unable to allocate IRQ %d\n", dd->pdev->irq);
		goto out2;
	}

	/* Enable interrupts on the HBA. */
	writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
					dd->mmio + HOST_CTL);

	init_timer(&dd->port->cmd_timer);
3174 3175
	init_waitqueue_head(&dd->port->svc_wait);

3176 3177 3178 3179 3180
	dd->port->cmd_timer.data = (unsigned long int) dd->port;
	dd->port->cmd_timer.function = mtip_timeout_function;
	mod_timer(&dd->port->cmd_timer,
		jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));

3181

A
Asai Thambi S P 已提交
3182
	if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3183 3184 3185 3186
		rv = -EFAULT;
		goto out3;
	}

3187 3188 3189 3190 3191 3192 3193
	if (mtip_get_identify(dd->port, NULL) < 0) {
		rv = -EFAULT;
		goto out3;
	}

	if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
		MTIP_FTL_REBUILD_MAGIC) {
A
Asai Thambi S P 已提交
3194
		set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3195
		return MTIP_FTL_REBUILD_MAGIC;
3196
	}
3197
	mtip_dump_identify(dd->port);
3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211

	/* check write protect, over temp and rebuild statuses */
	rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
				dd->port->log_buf,
				dd->port->log_buf_dma, 1);
	if (rv) {
		dev_warn(&dd->pdev->dev,
			"Error in READ LOG EXT (10h) command\n");
		/* non-critical error, don't fail the load */
	} else {
		buf = (unsigned char *)dd->port->log_buf;
		if (buf[259] & 0x1) {
			dev_info(&dd->pdev->dev,
				"Write protect bit is set.\n");
A
Asai Thambi S P 已提交
3212
			set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3213 3214 3215 3216
		}
		if (buf[288] == 0xF7) {
			dev_info(&dd->pdev->dev,
				"Exceeded Tmax, drive in thermal shutdown.\n");
A
Asai Thambi S P 已提交
3217
			set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
		}
		if (buf[288] == 0xBF) {
			dev_info(&dd->pdev->dev,
				"Drive indicates rebuild has failed.\n");
			/* TODO */
		}
	}

	/* get write protect progess */
	memset(&attr242, 0, sizeof(struct smart_attr));
	if (mtip_get_smart_attr(dd->port, 242, &attr242))
		dev_warn(&dd->pdev->dev,
				"Unable to check write protect progress\n");
	else
		dev_info(&dd->pdev->dev,
3233 3234
				"Write protect progress: %u%% (%u blocks)\n",
				attr242.cur, le32_to_cpu(attr242.data));
3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
	return rv;

out3:
	del_timer_sync(&dd->port->cmd_timer);

	/* Disable interrupts on the HBA. */
	writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
			dd->mmio + HOST_CTL);

	/*Release the IRQ. */
	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);

out2:
	mtip_deinit_port(dd->port);

	/* Free the command/command header memory. */
	dmam_free_coherent(&dd->pdev->dev,
3252
				HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
				dd->port->command_list,
				dd->port->command_list_dma);
out1:
	/* Free the memory allocated for the for structure. */
	kfree(dd->port);

	return rv;
}

/*
 * Called to deinitialize an interface.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
3270
static int mtip_hw_exit(struct driver_data *dd)
3271 3272 3273 3274 3275
{
	/*
	 * Send standby immediate (E0h) to the drive so that it
	 * saves its state.
	 */
A
Asai Thambi S P 已提交
3276
	if (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
3277

A
Asai Thambi S P 已提交
3278
		if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags))
3279 3280 3281
			if (mtip_standby_immediate(dd->port))
				dev_warn(&dd->pdev->dev,
					"STANDBY IMMEDIATE failed\n");
3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295

		/* de-initialize the port. */
		mtip_deinit_port(dd->port);

		/* Disable interrupts on the HBA. */
		writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
				dd->mmio + HOST_CTL);
	}

	del_timer_sync(&dd->port->cmd_timer);

	/* Release the IRQ. */
	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);

3296 3297 3298
	/* Stop the bottom half tasklet. */
	tasklet_kill(&dd->tasklet);

3299 3300
	/* Free the command/command header memory. */
	dmam_free_coherent(&dd->pdev->dev,
3301
			HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320
			dd->port->command_list,
			dd->port->command_list_dma);
	/* Free the memory allocated for the for structure. */
	kfree(dd->port);

	return 0;
}

/*
 * Issue a Standby Immediate command to the device.
 *
 * This function is called by the Block Layer just before the
 * system powers off during a shutdown.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
3321
static int mtip_hw_shutdown(struct driver_data *dd)
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343
{
	/*
	 * Send standby immediate (E0h) to the drive so that it
	 * saves its state.
	 */
	mtip_standby_immediate(dd->port);

	return 0;
}

/*
 * Suspend function
 *
 * This function is called by the Block Layer just before the
 * system hibernates.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0	Suspend was successful
 *	-EFAULT Suspend was not successful
 */
3344
static int mtip_hw_suspend(struct driver_data *dd)
3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
{
	/*
	 * Send standby immediate (E0h) to the drive
	 * so that it saves its state.
	 */
	if (mtip_standby_immediate(dd->port) != 0) {
		dev_err(&dd->pdev->dev,
			"Failed standby-immediate command\n");
		return -EFAULT;
	}

	/* Disable interrupts on the HBA.*/
	writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
			dd->mmio + HOST_CTL);
	mtip_deinit_port(dd->port);

	return 0;
}

/*
 * Resume function
 *
 * This function is called by the Block Layer as the
 * system resumes.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0	Resume was successful
 *      -EFAULT Resume was not successful
 */
3376
static int mtip_hw_resume(struct driver_data *dd)
3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458
{
	/* Perform any needed hardware setup steps */
	hba_setup(dd);

	/* Reset the HBA */
	if (mtip_hba_reset(dd) != 0) {
		dev_err(&dd->pdev->dev,
			"Unable to reset the HBA\n");
		return -EFAULT;
	}

	/*
	 * Enable the port, DMA engine, and FIS reception specific
	 * h/w in controller.
	 */
	mtip_init_port(dd->port);
	mtip_start_port(dd->port);

	/* Enable interrupts on the HBA.*/
	writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
			dd->mmio + HOST_CTL);

	return 0;
}

/*
 * Helper function for reusing disk name
 * upon hot insertion.
 */
static int rssd_disk_name_format(char *prefix,
				 int index,
				 char *buf,
				 int buflen)
{
	const int base = 'z' - 'a' + 1;
	char *begin = buf + strlen(prefix);
	char *end = buf + buflen;
	char *p;
	int unit;

	p = end - 1;
	*p = '\0';
	unit = base;
	do {
		if (p == begin)
			return -EINVAL;
		*--p = 'a' + (index % unit);
		index = (index / unit) - 1;
	} while (index >= 0);

	memmove(begin, p, end - p);
	memcpy(buf, prefix, strlen(prefix));

	return 0;
}

/*
 * Block layer IOCTL handler.
 *
 * @dev Pointer to the block_device structure.
 * @mode ignored
 * @cmd IOCTL command passed from the user application.
 * @arg Argument passed from the user application.
 *
 * return value
 *	0        IOCTL completed successfully.
 *	-ENOTTY  IOCTL not supported or invalid driver data
 *                 structure pointer.
 */
static int mtip_block_ioctl(struct block_device *dev,
			    fmode_t mode,
			    unsigned cmd,
			    unsigned long arg)
{
	struct driver_data *dd = dev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (!dd)
		return -ENOTTY;

A
Asai Thambi S P 已提交
3459
	if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3460 3461
		return -ENOTTY;

3462 3463
	switch (cmd) {
	case BLKFLSBUF:
3464
		return -ENOTTY;
3465
	default:
3466
		return mtip_hw_ioctl(dd, cmd, arg);
3467 3468 3469
	}
}

3470
#ifdef CONFIG_COMPAT
3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496
/*
 * Block layer compat IOCTL handler.
 *
 * @dev Pointer to the block_device structure.
 * @mode ignored
 * @cmd IOCTL command passed from the user application.
 * @arg Argument passed from the user application.
 *
 * return value
 *	0        IOCTL completed successfully.
 *	-ENOTTY  IOCTL not supported or invalid driver data
 *                 structure pointer.
 */
static int mtip_block_compat_ioctl(struct block_device *dev,
			    fmode_t mode,
			    unsigned cmd,
			    unsigned long arg)
{
	struct driver_data *dd = dev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (!dd)
		return -ENOTTY;

A
Asai Thambi S P 已提交
3497
	if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3498 3499
		return -ENOTTY;

3500 3501
	switch (cmd) {
	case BLKFLSBUF:
3502
		return -ENOTTY;
3503
	case HDIO_DRIVE_TASKFILE: {
3504
		struct mtip_compat_ide_task_request_s __user *compat_req_task;
3505 3506 3507
		ide_task_request_t req_task;
		int compat_tasksize, outtotal, ret;

3508 3509
		compat_tasksize =
			sizeof(struct mtip_compat_ide_task_request_s);
3510 3511 3512 3513 3514

		compat_req_task =
			(struct mtip_compat_ide_task_request_s __user *) arg;

		if (copy_from_user(&req_task, (void __user *) arg,
3515
			compat_tasksize - (2 * sizeof(compat_long_t))))
3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541
			return -EFAULT;

		if (get_user(req_task.out_size, &compat_req_task->out_size))
			return -EFAULT;

		if (get_user(req_task.in_size, &compat_req_task->in_size))
			return -EFAULT;

		outtotal = sizeof(struct mtip_compat_ide_task_request_s);

		ret = exec_drive_taskfile(dd, (void __user *) arg,
						&req_task, outtotal);

		if (copy_to_user((void __user *) arg, &req_task,
				compat_tasksize -
				(2 * sizeof(compat_long_t))))
			return -EFAULT;

		if (put_user(req_task.out_size, &compat_req_task->out_size))
			return -EFAULT;

		if (put_user(req_task.in_size, &compat_req_task->in_size))
			return -EFAULT;

		return ret;
	}
3542
	default:
3543
		return mtip_hw_ioctl(dd, cmd, arg);
3544 3545
	}
}
3546
#endif
3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582

/*
 * Obtain the geometry of the device.
 *
 * You may think that this function is obsolete, but some applications,
 * fdisk for example still used CHS values. This function describes the
 * device as having 224 heads and 56 sectors per cylinder. These values are
 * chosen so that each cylinder is aligned on a 4KB boundary. Since a
 * partition is described in terms of a start and end cylinder this means
 * that each partition is also 4KB aligned. Non-aligned partitions adversely
 * affects performance.
 *
 * @dev Pointer to the block_device strucutre.
 * @geo Pointer to a hd_geometry structure.
 *
 * return value
 *	0       Operation completed successfully.
 *	-ENOTTY An error occurred while reading the drive capacity.
 */
static int mtip_block_getgeo(struct block_device *dev,
				struct hd_geometry *geo)
{
	struct driver_data *dd = dev->bd_disk->private_data;
	sector_t capacity;

	if (!dd)
		return -ENOTTY;

	if (!(mtip_hw_get_capacity(dd, &capacity))) {
		dev_warn(&dd->pdev->dev,
			"Could not get drive capacity.\n");
		return -ENOTTY;
	}

	geo->heads = 224;
	geo->sectors = 56;
3583
	sector_div(capacity, (geo->heads * geo->sectors));
3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595
	geo->cylinders = capacity;
	return 0;
}

/*
 * Block device operation function.
 *
 * This structure contains pointers to the functions required by the block
 * layer.
 */
static const struct block_device_operations mtip_block_ops = {
	.ioctl		= mtip_block_ioctl,
3596
#ifdef CONFIG_COMPAT
3597
	.compat_ioctl	= mtip_block_compat_ioctl,
3598
#endif
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613
	.getgeo		= mtip_block_getgeo,
	.owner		= THIS_MODULE
};

/*
 * Block layer make request function.
 *
 * This function is called by the kernel to process a BIO for
 * the P320 device.
 *
 * @queue Pointer to the request queue. Unused other than to obtain
 *              the driver data structure.
 * @bio   Pointer to the BIO.
 *
 */
3614
static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3615 3616 3617 3618 3619 3620 3621
{
	struct driver_data *dd = queue->queuedata;
	struct scatterlist *sg;
	struct bio_vec *bvec;
	int nents = 0;
	int tag = 0;

3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637
	if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
		if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
							&dd->dd_flag))) {
			bio_endio(bio, -ENXIO);
			return;
		}
		if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
			bio_endio(bio, -ENODATA);
			return;
		}
		if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
							&dd->dd_flag) &&
				bio_data_dir(bio))) {
			bio_endio(bio, -ENODATA);
			return;
		}
3638 3639 3640 3641
		if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))) {
			bio_endio(bio, -ENODATA);
			return;
		}
3642 3643
	}

3644 3645 3646
	if (unlikely(!bio_has_data(bio))) {
		blk_queue_flush(queue, 0);
		bio_endio(bio, 0);
3647
		return;
3648 3649 3650 3651 3652 3653 3654 3655
	}

	sg = mtip_hw_get_scatterlist(dd, &tag);
	if (likely(sg != NULL)) {
		blk_queue_bounce(queue, &bio);

		if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
			dev_warn(&dd->pdev->dev,
3656
				"Maximum number of SGL entries exceeded\n");
3657 3658
			bio_io_error(bio);
			mtip_hw_release_scatterlist(dd, tag);
3659
			return;
3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678
		}

		/* Create the scatter list for this bio. */
		bio_for_each_segment(bvec, bio, nents) {
			sg_set_page(&sg[nents],
					bvec->bv_page,
					bvec->bv_len,
					bvec->bv_offset);
		}

		/* Issue the read/write. */
		mtip_hw_submit_io(dd,
				bio->bi_sector,
				bio_sectors(bio),
				nents,
				tag,
				bio_endio,
				bio,
				bio_data_dir(bio));
3679
	} else
3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693
		bio_io_error(bio);
}

/*
 * Block layer initialization function.
 *
 * This function is called once by the PCI layer for each P320
 * device that is connected to the system.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0 on success else an error code.
 */
3694
static int mtip_block_initialize(struct driver_data *dd)
3695
{
3696
	int rv = 0, wait_for_rebuild = 0;
3697 3698 3699
	sector_t capacity;
	unsigned int index = 0;
	struct kobject *kobj;
3700
	unsigned char thd_name[16];
3701

3702 3703 3704
	if (dd->disk)
		goto skip_create_disk; /* hw init done, before rebuild */

3705
	/* Initialize the protocol layer. */
3706 3707
	wait_for_rebuild = mtip_hw_init(dd);
	if (wait_for_rebuild < 0) {
3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748
		dev_err(&dd->pdev->dev,
			"Protocol layer initialization failed\n");
		rv = -EINVAL;
		goto protocol_init_error;
	}

	dd->disk = alloc_disk(MTIP_MAX_MINORS);
	if (dd->disk  == NULL) {
		dev_err(&dd->pdev->dev,
			"Unable to allocate gendisk structure\n");
		rv = -EINVAL;
		goto alloc_disk_error;
	}

	/* Generate the disk name, implemented same as in sd.c */
	do {
		if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
			goto ida_get_error;

		spin_lock(&rssd_index_lock);
		rv = ida_get_new(&rssd_index_ida, &index);
		spin_unlock(&rssd_index_lock);
	} while (rv == -EAGAIN);

	if (rv)
		goto ida_get_error;

	rv = rssd_disk_name_format("rssd",
				index,
				dd->disk->disk_name,
				DISK_NAME_LEN);
	if (rv)
		goto disk_index_error;

	dd->disk->driverfs_dev	= &dd->pdev->dev;
	dd->disk->major		= dd->major;
	dd->disk->first_minor	= dd->instance * MTIP_MAX_MINORS;
	dd->disk->fops		= &mtip_block_ops;
	dd->disk->private_data	= dd;
	dd->index		= index;

3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775
	/*
	 * if rebuild pending, start the service thread, and delay the block
	 * queue creation and add_disk()
	 */
	if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
		goto start_service_thread;

skip_create_disk:
	/* Allocate the request queue. */
	dd->queue = blk_alloc_queue(GFP_KERNEL);
	if (dd->queue == NULL) {
		dev_err(&dd->pdev->dev,
			"Unable to allocate request queue\n");
		rv = -ENOMEM;
		goto block_queue_alloc_init_error;
	}

	/* Attach our request function to the request queue. */
	blk_queue_make_request(dd->queue, mtip_make_request);

	dd->disk->queue		= dd->queue;
	dd->queue->queuedata	= dd;

	/* Set device limits. */
	set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
	blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
	blk_queue_physical_block_size(dd->queue, 4096);
3776 3777
	blk_queue_max_hw_sectors(dd->queue, 0xffff);
	blk_queue_max_segment_size(dd->queue, 0x400000);
3778
	blk_queue_io_min(dd->queue, 4096);
3779

3780 3781 3782 3783
	/*
	 * write back cache is not supported in the device. FUA depends on
	 * write back cache support, hence setting flush support to zero.
	 */
3784 3785
	blk_queue_flush(dd->queue, 0);

3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806
	/* Set the capacity of the device in 512 byte sectors. */
	if (!(mtip_hw_get_capacity(dd, &capacity))) {
		dev_warn(&dd->pdev->dev,
			"Could not read drive capacity\n");
		rv = -EIO;
		goto read_capacity_error;
	}
	set_capacity(dd->disk, capacity);

	/* Enable the block device and add it to /dev */
	add_disk(dd->disk);

	/*
	 * Now that the disk is active, initialize any sysfs attributes
	 * managed by the protocol layer.
	 */
	kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
	if (kobj) {
		mtip_hw_sysfs_init(dd, kobj);
		kobject_put(kobj);
	}
3807
	mtip_hw_debugfs_init(dd);
3808

3809
	if (dd->mtip_svc_handler) {
A
Asai Thambi S P 已提交
3810
		set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3811
		return rv; /* service thread created for handling rebuild */
3812
	}
3813 3814

start_service_thread:
3815 3816 3817 3818 3819 3820
	sprintf(thd_name, "mtip_svc_thd_%02d", index);

	dd->mtip_svc_handler = kthread_run(mtip_service_thread,
						dd, thd_name);

	if (IS_ERR(dd->mtip_svc_handler)) {
3821
		dev_err(&dd->pdev->dev, "service thread failed to start\n");
3822 3823
		dd->mtip_svc_handler = NULL;
		rv = -EFAULT;
3824
		goto kthread_run_error;
3825 3826
	}

3827 3828 3829
	if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
		rv = wait_for_rebuild;

3830 3831
	return rv;

3832
kthread_run_error:
3833 3834
	mtip_hw_debugfs_exit(dd);

3835
	/* Delete our gendisk. This also removes the device from /dev */
3836 3837
	del_gendisk(dd->disk);

3838 3839 3840 3841
read_capacity_error:
	blk_cleanup_queue(dd->queue);

block_queue_alloc_init_error:
3842 3843 3844 3845 3846 3847 3848 3849 3850
disk_index_error:
	spin_lock(&rssd_index_lock);
	ida_remove(&rssd_index_ida, index);
	spin_unlock(&rssd_index_lock);

ida_get_error:
	put_disk(dd->disk);

alloc_disk_error:
3851
	mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866

protocol_init_error:
	return rv;
}

/*
 * Block layer deinitialization function.
 *
 * Called by the PCI layer as each P320 device is removed.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
3867
static int mtip_block_remove(struct driver_data *dd)
3868 3869
{
	struct kobject *kobj;
3870 3871

	if (dd->mtip_svc_handler) {
3872
		set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3873 3874 3875 3876
		wake_up_interruptible(&dd->port->svc_wait);
		kthread_stop(dd->mtip_svc_handler);
	}

3877
	/* Clean up the sysfs attributes, if created */
A
Asai Thambi S P 已提交
3878
	if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3879 3880 3881 3882 3883
		kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
		if (kobj) {
			mtip_hw_sysfs_exit(dd, kobj);
			kobject_put(kobj);
		}
3884
	}
3885
	mtip_hw_debugfs_exit(dd);
3886 3887 3888 3889 3890

	/*
	 * Delete our gendisk structure. This also removes the device
	 * from /dev
	 */
3891 3892 3893 3894 3895 3896
	if (dd->disk) {
		if (dd->disk->queue)
			del_gendisk(dd->disk);
		else
			put_disk(dd->disk);
	}
A
Asai Thambi S P 已提交
3897 3898 3899 3900 3901

	spin_lock(&rssd_index_lock);
	ida_remove(&rssd_index_ida, dd->index);
	spin_unlock(&rssd_index_lock);

3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923
	blk_cleanup_queue(dd->queue);
	dd->disk  = NULL;
	dd->queue = NULL;

	/* De-initialize the protocol layer. */
	mtip_hw_exit(dd);

	return 0;
}

/*
 * Function called by the PCI layer when just before the
 * machine shuts down.
 *
 * If a protocol layer shutdown function is present it will be called
 * by this function.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
3924
static int mtip_block_shutdown(struct driver_data *dd)
3925 3926 3927 3928 3929
{
	dev_info(&dd->pdev->dev,
		"Shutting down %s ...\n", dd->disk->disk_name);

	/* Delete our gendisk structure, and cleanup the blk queue. */
3930 3931 3932 3933 3934 3935 3936
	if (dd->disk) {
		if (dd->disk->queue)
			del_gendisk(dd->disk);
		else
			put_disk(dd->disk);
	}

A
Asai Thambi S P 已提交
3937 3938 3939 3940 3941

	spin_lock(&rssd_index_lock);
	ida_remove(&rssd_index_ida, dd->index);
	spin_unlock(&rssd_index_lock);

3942 3943 3944 3945 3946 3947 3948 3949
	blk_cleanup_queue(dd->queue);
	dd->disk  = NULL;
	dd->queue = NULL;

	mtip_hw_shutdown(dd);
	return 0;
}

3950
static int mtip_block_suspend(struct driver_data *dd)
3951 3952 3953 3954 3955 3956 3957
{
	dev_info(&dd->pdev->dev,
		"Suspending %s ...\n", dd->disk->disk_name);
	mtip_hw_suspend(dd);
	return 0;
}

3958
static int mtip_block_resume(struct driver_data *dd)
3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044
{
	dev_info(&dd->pdev->dev, "Resuming %s ...\n",
		dd->disk->disk_name);
	mtip_hw_resume(dd);
	return 0;
}

/*
 * Called for each supported PCI device detected.
 *
 * This function allocates the private data structure, enables the
 * PCI device and then calls the block layer initialization function.
 *
 * return value
 *	0 on success else an error code.
 */
static int mtip_pci_probe(struct pci_dev *pdev,
			const struct pci_device_id *ent)
{
	int rv = 0;
	struct driver_data *dd = NULL;

	/* Allocate memory for this devices private data. */
	dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL);
	if (dd == NULL) {
		dev_err(&pdev->dev,
			"Unable to allocate memory for driver data\n");
		return -ENOMEM;
	}

	/* Attach the private data to this PCI device.  */
	pci_set_drvdata(pdev, dd);

	rv = pcim_enable_device(pdev);
	if (rv < 0) {
		dev_err(&pdev->dev, "Unable to enable device\n");
		goto iomap_err;
	}

	/* Map BAR5 to memory. */
	rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
	if (rv < 0) {
		dev_err(&pdev->dev, "Unable to map regions\n");
		goto iomap_err;
	}

	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
		rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));

		if (rv) {
			rv = pci_set_consistent_dma_mask(pdev,
						DMA_BIT_MASK(32));
			if (rv) {
				dev_warn(&pdev->dev,
					"64-bit DMA enable failed\n");
				goto setmask_err;
			}
		}
	}

	pci_set_master(pdev);

	if (pci_enable_msi(pdev)) {
		dev_warn(&pdev->dev,
			"Unable to enable MSI interrupt.\n");
		goto block_initialize_err;
	}

	/* Copy the info we may need later into the private data structure. */
	dd->major	= mtip_major;
	dd->instance	= instance;
	dd->pdev	= pdev;

	/* Initialize the block layer. */
	rv = mtip_block_initialize(dd);
	if (rv < 0) {
		dev_err(&pdev->dev,
			"Unable to initialize block layer\n");
		goto block_initialize_err;
	}

	/*
	 * Increment the instance count so that each device has a unique
	 * instance number.
	 */
	instance++;
4045
	if (rv != MTIP_FTL_REBUILD_MAGIC)
A
Asai Thambi S P 已提交
4046
		set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074
	goto done;

block_initialize_err:
	pci_disable_msi(pdev);

setmask_err:
	pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);

iomap_err:
	kfree(dd);
	pci_set_drvdata(pdev, NULL);
	return rv;
done:
	return rv;
}

/*
 * Called for each probed device when the device is removed or the
 * driver is unloaded.
 *
 * return value
 *	None
 */
static void mtip_pci_remove(struct pci_dev *pdev)
{
	struct driver_data *dd = pci_get_drvdata(pdev);
	int counter = 0;

A
Asai Thambi S P 已提交
4075
	set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4076

4077
	if (mtip_check_surprise_removal(pdev)) {
A
Asai Thambi S P 已提交
4078
		while (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
			counter++;
			msleep(20);
			if (counter == 10) {
				/* Cleanup the outstanding commands */
				mtip_command_cleanup(dd);
				break;
			}
		}
	}

	/* Clean up the block layer. */
	mtip_block_remove(dd);

	pci_disable_msi(pdev);

	kfree(dd);
	pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
}

/*
 * Called for each probed device when the device is suspended.
 *
 * return value
 *	0  Success
 *	<0 Error
 */
static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
	int rv = 0;
	struct driver_data *dd = pci_get_drvdata(pdev);

	if (!dd) {
		dev_err(&pdev->dev,
			"Driver private datastructure is NULL\n");
		return -EFAULT;
	}

A
Asai Thambi S P 已提交
4116
	set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181

	/* Disable ports & interrupts then send standby immediate */
	rv = mtip_block_suspend(dd);
	if (rv < 0) {
		dev_err(&pdev->dev,
			"Failed to suspend controller\n");
		return rv;
	}

	/*
	 * Save the pci config space to pdev structure &
	 * disable the device
	 */
	pci_save_state(pdev);
	pci_disable_device(pdev);

	/* Move to Low power state*/
	pci_set_power_state(pdev, PCI_D3hot);

	return rv;
}

/*
 * Called for each probed device when the device is resumed.
 *
 * return value
 *      0  Success
 *      <0 Error
 */
static int mtip_pci_resume(struct pci_dev *pdev)
{
	int rv = 0;
	struct driver_data *dd;

	dd = pci_get_drvdata(pdev);
	if (!dd) {
		dev_err(&pdev->dev,
			"Driver private datastructure is NULL\n");
		return -EFAULT;
	}

	/* Move the device to active State */
	pci_set_power_state(pdev, PCI_D0);

	/* Restore PCI configuration space */
	pci_restore_state(pdev);

	/* Enable the PCI device*/
	rv = pcim_enable_device(pdev);
	if (rv < 0) {
		dev_err(&pdev->dev,
			"Failed to enable card during resume\n");
		goto err;
	}
	pci_set_master(pdev);

	/*
	 * Calls hbaReset, initPort, & startPort function
	 * then enables interrupts
	 */
	rv = mtip_block_resume(dd);
	if (rv < 0)
		dev_err(&pdev->dev, "Unable to resume\n");

err:
A
Asai Thambi S P 已提交
4182
	clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201

	return rv;
}

/*
 * Shutdown routine
 *
 * return value
 *      None
 */
static void mtip_pci_shutdown(struct pci_dev *pdev)
{
	struct driver_data *dd = pci_get_drvdata(pdev);
	if (dd)
		mtip_block_shutdown(dd);
}

/* Table of device ids supported by this driver. */
static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
4202 4203 4204 4205 4206 4207 4208
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4209 4210 4211 4212
	{ 0 }
};

/* Structure that describes the PCI driver functions. */
4213
static struct pci_driver mtip_pci_driver = {
4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236
	.name			= MTIP_DRV_NAME,
	.id_table		= mtip_pci_tbl,
	.probe			= mtip_pci_probe,
	.remove			= mtip_pci_remove,
	.suspend		= mtip_pci_suspend,
	.resume			= mtip_pci_resume,
	.shutdown		= mtip_pci_shutdown,
};

MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);

/*
 * Module initialization function.
 *
 * Called once when the module is loaded. This function allocates a major
 * block device number to the Cyclone devices and registers the PCI layer
 * of the driver.
 *
 * Return value
 *      0 on success else error code.
 */
static int __init mtip_init(void)
{
4237 4238
	int error;

4239
	pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4240 4241

	/* Allocate a major block device number to use with this driver. */
4242 4243
	error = register_blkdev(0, MTIP_DRV_NAME);
	if (error <= 0) {
4244
		pr_err("Unable to register block device (%d)\n",
4245
		error);
4246 4247
		return -EBUSY;
	}
4248
	mtip_major = error;
4249

4250 4251 4252
	if (!dfs_parent) {
		dfs_parent = debugfs_create_dir("rssd", NULL);
		if (IS_ERR_OR_NULL(dfs_parent)) {
4253
			pr_warn("Error creating debugfs parent\n");
4254 4255 4256 4257
			dfs_parent = NULL;
		}
	}

4258
	/* Register our PCI operations. */
4259
	error = pci_register_driver(&mtip_pci_driver);
4260 4261
	if (error) {
		debugfs_remove(dfs_parent);
4262
		unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4263
	}
4264 4265

	return error;
4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279
}

/*
 * Module de-initialization function.
 *
 * Called once when the module is unloaded. This function deallocates
 * the major block device number allocated by mtip_init() and
 * unregisters the PCI layer of the driver.
 *
 * Return value
 *      none
 */
static void __exit mtip_exit(void)
{
4280 4281
	debugfs_remove_recursive(dfs_parent);

4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295
	/* Release the allocated major block device number. */
	unregister_blkdev(mtip_major, MTIP_DRV_NAME);

	/* Unregister the PCI driver. */
	pci_unregister_driver(&mtip_pci_driver);
}

MODULE_AUTHOR("Micron Technology, Inc");
MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(MTIP_DRV_VERSION);

module_init(mtip_init);
module_exit(mtip_exit);